Multiple images upload failing in Chrome and Firefox

Question

I have found an odd behavior of an uploading images into media library. Depends on a browser, I can select multiple files at the time or not. For example:

It doesn't work in Chrome and in Firefox:

It works fine in Opera:

But it works fine in the Chrome browser on the machine of my colleague.

I thought that the reason is in Adobe Flash which isn't probably installed in my Chrome and is installed for Chrome of my colleague, but not, it isn't installed for both.

Maybe someone knows a reason of this behavior? I need to explain client why he can't select multiple files, but I don't have any idea and I can't recommend him to use Opera browser :).

Answer 1

I saw this behavior when you have a firewall, antivirus or cookies are corrupted. Somehow
Please try to delete all your cookies and try again.

Cookie with key : sc_fv contains Flash Version and probably somehow this one was corrupted.
On the method Sitecore.Shell.Framework.Commands.Media.MultiUpload.QueryState(CommandContext context) is verifying method UseFlashUpload

This method verify if your Sitecore Client SupportFlashUpload:

public virtual bool SupportsFlashUpload
{
    get
    {
        return this.GetFlashVersion().Major >= 9;
    }
}

on the method GetFlashVersion it reads sc_fv cookie value:

    protected virtual Version GetFlashVersion()
    {
    string cookieValue = WebUtil.GetCookieValue("sc_fv");
    if (string.IsNullOrEmpty(cookieValue))
    {
        return new Version(0, 0, 0);
    }
    string[] array = cookieValue.Split(new char[]
    {
        '.'
    });
    if (array.Length != 3)
    {
        Log.Error("Unexpected flash version cookie value: " + cookieValue, this);
        return new Version(0, 0, 0);
    }
    int @int = MainUtil.GetInt(array[0], 0);
    int int2 = MainUtil.GetInt(array[1], 0);
    int int3 = MainUtil.GetInt(array[2], 0);
    return new Version(@int, int2, int3);
 }

Answer 2

To add to this, Flash is indeed the culprit. If you're looking for something a little more perm. support recommends the following:

For the 'Upload File' dialog:

1. Navigate to \Website\sitecore\shell\Applications\Media\Upload Media\
2. Open the UploadMedia.xml file
3. On line 27, add the attribute multiple="true" to the <input id="File" ... /> tag:
   <input id="File" name="File" type="file" style="width:100%" multiple="true"/>

For the "Upload files (advanced)" dialog:

1. Navigate to the \Website\sitecore\shell\Applications\Media\UploadManager folder
2. Open Upload.aspx
3. Find the <input id="File0" name="File0" .../> tag inside the file and add the multiple="true" attribute:
   <input multiple="true" id="File0" name="File0" type="file" value="browse" onchange="javascript:return Sitecore.Upload.change(this)"/>
4. Open the Upload.aspx.js file
5. Search for ctl.type = "file"; line and put a new line after it:
   ctl.multiple = true;

Please note that this workaround has not passed full QA cycle. In case of any issue with upload please revert the changes.

Answer 3

The problem stems from the cookie sc_fv resetting to the value of 0.0.0 upon browser restart. The best workaround I found was using a browser extension such as edit this cookie to lock the value of the cookie to 31.0.0