Hi @IOPNdev,
This isn’t entirely the same issue, but this seems similar to what has been encountered here with the mime type not being correctly identified: .WMV galley files open as .ASX files in OJS 3.3.0.6 - #18 by NateWr
What you might want to do as a first step is check what the mimetype is as per this SQL query:
-Roger
PKP Team