Help with uploading game props?

So I am helping a few people with a game but sometimes whenever I try to upload the file to the site this happens.

It doesn’t work when I try uploading to mediafire either. This only happens with a few of my blend files. Before I try uploading them I pack into blend and save. What’s wrong? How do I fix it?

You should ask at mediafire. This is not blender related.

no the picture that I have with the post is what came up after trying to upload to blender artists.

How big is the file ? Blenderartists has a maximum file size limit.