PowerPoint file upload error

Hello ,getting an error while uploading Microsoft PowerPoint presentation file. It’s a big one, 800+ slides. System’s pop up says “an error occurs” without any additional information. How can this be solved?

More that sure file is bigger that 100 or 200 megabyte (don’t remember exactly but Crowdin has file size limit as 100 or 200 mb per 1 file).

If it’s a presentation, just divide it into few separated files and upload 1 by 1. Once translated, you can “bring” them back on into 1 big file.