I loaded a MP4 file (around 5MB) to a site assets library.
When I try to edit the properties I get this error:
The URL is invalid. It may refer to a nonexistent file or folder, or refer to a valid file or folder that is not in the current Web.
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It's a known issue.
To work around this issue, remove the Version column from the list of Indexed Columns for the list that has this issue. To do this, follow these steps: Browse to the list where the issue exists. In the ribbon, click the Library tab, and then click Library Settings. In the fields list, click Indexed Columns. In the Indexed Columns list, click Version. Click Delete, and then click OK. Upload any files that you previously experienced the issue with.