How to upload images to server with selenium in python?

I am using Selenium and Python, and have run into this problem. I have to upload an image to the server and I don't see the way.

The HTML code is this.

<a id="file_upload" href="javascript:;">Añadir imágenes</a>

When you click on this link, the typical system window for selecting files opens.

At the moment the only thing I have managed to do is locate the element and click on it.

 img_upload = driver.find_element_by_id("file_upload")
 img_upload .click()

I have also tried like this but nothing happens

img_upload = driver.find_element_by_id("file_upload")
img_upload.send_keys(img_path)

Any idea how to upload the image?

Well, I know this is crazy because it's coded... but it's the JavaScript code snippet that controls uploading the file... I'm posting it for what it's worth.

function s() {
    var e, s;
    i.extend(this, {
        init: function(u) {
            var c, l, d, m, h, f, p = this,
                g = p.getRuntime();

            e = u, d = o.extList2mimes(e.accept, g.can("filter_by_extension")),
                l = g.getShimContainer(),

                l.innerHTML = '<input id="' + g.uid + '" type="file" style="font-size:999px;
            opacity: 0;
            "'+(e.multiple&&g.can("
            select_multiple ")?"
            multiple ":"
            ")+               
            (e.directory && g.can("select_folder") ?
                "webkitdirectory directory" : "") +
            (d ? ' accept="' + d.join(",") + '"' : "") + " />",
            c = n.get(g.uid), i.extend(c.style,

                    {
                        position: "absolute",
                        top: 0,
                        left: 0,
                        width: "100%",
                        height: "100%"
                    }), m = n.get(e.browse_button), s = n.getStyle(m, "z-index") || "auto", g.can("summon_file_dialog") && ("static" === n.getStyle(m, "position") &&

                    (m.style.position = "relative"), r.addEvent(m, "click", function(e) {
                        var t = n.get(g.uid);
                        t && !t.disabled &&

                            t.click(), e.preventDefault()
                    }, p.uid), p.bind("Refresh", function() {
                        h = parseInt(s, 10) || 1, n.get(e.browse_button).style.zIndex = h, this.getRuntime().getShimContainer().style.zIndex = h - 1
                    })), f = g.can("summon_file_dialog") ? m : l, r.addEvent(f, "mouseover", function()

                    {
                        p.trigger("mouseenter")
                    }, p.uid), r.addEvent(f, "mouseout", function()

                    {
                        p.trigger("mouseleave")
                    }, p.uid), r.addEvent(f, "mousedown", function()

                    {
                        p.trigger("mousedown")
                    }, p.uid), r.addEvent(n.get(e.container), "mouseup", function() {
                    p.trigger("mouseup")
                }, p.uid),

                (g.can("summon_file_dialog") ? c : m).setAttribute("tabindex", -1), c.onchange = function x() {
                    if (p.files = [], i.each(this.files, function(i) {
                            var n = "";
                            return e.directory && "." == i.name ? !0 : (i.webkitRelativePath && (n = "/" + i.webkitRelativePath.replace(/^\//, "")), i = new t(g.uid, i), i.relativePath = n, p.files.push(i), void

                                0)
                        }), "IE" !== a.browser && "IEMobile" !== a.browser) this.value = "";
                    else {
                        var n = this.cloneNode(!0);

                        this.parentNode.replaceChild(n, this), n.onchange = x
                    }
                    p.files.length && p.trigger("change")
                }, p.trigger({
                    type: "ready",
                    async: !0
                }), l = null
        },
        setOption: function(e, t) {
            var i = this.getRuntime(),
                r = n.get(i.uid);
            switch (e) {
                case "accept":
                    if (t) {
                        var

                            a = t.mimes || o.extList2mimes(t, i.can("filter_by_extension"));
                        r.setAttribute("accept", a.join(","))
                    } else

                        r.removeAttribute("accept");
                    break;
                case "directory":
                    t && i.can("select_folder") ? (r.setAttribute("directory", ""), r.setAttribute("webkitdirectory", "")) : (r.removeAttribute("directory"), r.removeAttribute("webkitdirectory"));
                    break;
                case "multiple":
                    t && i.can("select_multiple") ? r.setAttribute("multiple", "") : r.removeAttribute("multiple")
            }
        },
        disable: function(e) {
            var t, i = this.getRuntime();
            (t = n.get(i.uid)) && (t.disabled = !!e)
        },
        destroy: function() {
            var

                t = this.getRuntime(),
                i = t.getShim(),
                o = t.getShimContainer(),
                a = e && n.get(e.container),
                u = e && n.get(e.browse_button);
            a && r.removeAllEvents(a, this.uid), u &&

                (r.removeAllEvents(u, this.uid), u.style.zIndex = s), o &&

                (r.removeAllEvents(o, this.uid), o.innerHTML = ""), i.removeInstance(this.uid), e = o = a = u = i = null
        }
    })
}
return e.FileInput = s
}), n("moxie/runtime/html5/file/FileDrop",

        ["moxie/runtime/html5/Runtime", "moxie/file/File", "moxie/core/utils/Basic", "moxie/core/utils/Dom", "moxie/core/utils/Events", "moxie/core/utils/Mime"],
        function(e, t, i, n, r, o) {
            function a() {
                function e(e) {
                    if (!e.dataTransfer || !e.dataTransfer.types) return !1;
                    var

                        t = i.toArray(e.dataTransfer.types || []);
                    return -1 !== i.inArray("Files", t) || -1 !== i.inArray("public.file-url", t) || -1 !== i.inArray("application/x-moz-file", t)
                }

                function a(e, i) {
                    if (u(e)) {
                        var n = new

                        t(f, e);
                        n.relativePath = i || "", p.push(n)
                    }
                }

                function s(e) {
                    for (var t = [], n = 0; n < e.length; n++)[].push.apply(t, e[n].extensions.split(/\s*,\s*/));
                    return -1 === i.inArray("*", t) ? t : []
                }

                function u(e) {
                    if (!g.length) return !0;
                    var t = o.getFileExtension(e.name);
                    return !t || -1 !== i.inArray(t, g)
                }

                function c(e, t) {
                    var n = [];
                    i.each(e, function(e) {
                        var t = e.webkitGetAsEntry();

                        t && (t.isFile ? a(e.getAsFile(), t.fullPath) : n.push(t))
                    }), n.length ? l(n, t) : t()
                }

                function l(e, t) {
                    var n = [];
                    i.each(e, function(e) {
                        n.push(function(t) {
                            d(e, t)
                        })
                    }), i.inSeries(n, function() {
                        t()
                    })
                }

                function d(e, t)


                {
                    e.isFile ? e.file(function(i) {
                        a(i, e.fullPath), t()
                    }, function() {
                        t()
                    }) : e.isDirectory ? m(e, t) : t()
                }

                function m(e, t) {
                    function i(e) {
                        r.readEntries(function(t) {
                            t.length ? ([].push.apply(n, t), i(e)) : e()
                        }, e)
                    }
                    var n = [],
                        r = e.createReader();
                    i(function() {
                        l(n, t)
                    })
                }
                var h, f, p = [],
                    g = [];
                i.extend(this, {
                    init: function(t) {
                        var n, o = this;

                        h = t, f = o.ruid, g = s(h.accept), n = h.container, r.addEvent(n, "dragover", function(t) {
                            e(t) && (t.preventDefault(), t.dataTransfer.dropEffect = "copy")
                        }, o.uid), r.addEvent(n, "drop", function(t) {
                            e(t) && (t.preventDefault(), p = [], t.dataTransfer.items && t.dataTransfer.items[0].webkitGetAsEntry ? c(t.dataTransfer.items, function() {
                                o.files = p, o.trigger("drop")
                            }) : (i.each(t.dataTransfer.files, function(e) {
                                a(e)
                            }), o.files = p, o.trigger("drop")))
                        }, o.uid), r.addEvent(n, "dragenter", function() {
                            o.trigger("dragenter")
                        }, o.uid), r.addEvent(n, "dragleave", function() {
                            o.trigger("dragleave")
                        }, o.uid)
                    },
                    destroy: function() {
                        r.removeAllEvents(h && n.get(h.container), this.uid), f = p = g = h = null, this.getRuntime().getShim().removeInstance(this.uid)
                    }
                })
            }
            return e.FileDrop = a
        }), n("moxie/runtime/html5/file/FileReader", ["moxie/runtime/html5/Runtime", "moxie/core/utils/Encode", "moxie/core/utils/Basic"], function(e, t, i) {
            function n() {
                function e(e) {
                    return t.atob(e.substring(e.indexOf("base64,") + 7))
                }
                var n, r = !1;
                i.extend(this, {
                    read: function(t, o) {
                        var a = this;
                        a.result = "", n = new window.FileReader, n.addEventListener("progress", function(e) {
                                a.trigger(e)
                            }), n.addEventListener("load", function(t) {
                                a.result = r ? e(n.result) : n.result, a.trigger(t)
                            }), n.addEventListener("error", function(e) {
                                a.trigger(e, n.error)
                            }), n.addEventListener("loadend", function(e) {
                                n = null, a.trigger(e)
                            }), "function" === i.typeOf(n[t]) ? (r = !1, n[t](o.getSource())) : "readAsBinaryString" === t &&

                            (r = !0, n.readAsDataURL(o.getSource()))
                    },
                    abort: function() {
                        n && n.abort()
                    },
                    destroy: function() {
                        n = null, this.getRuntime().getShim().removeInstance(this.uid)
                    }
                })
            }
            return