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Commented 5 years ago
Gelatin
Gelatin - Gelatin automatically merges PDF, RTF, TXT, MOV, M4V, MP4, MP3, AIFF, BMP, TIFF, PNG, JPG, JPEG & GIF files.
Hello. I am trying to join two mp4 files but having the same error message come up. Would you mind explaining how you 'add the extension manually'? As I can't see any way to do that... Cheers!