Drop box basic account limit for commercial use.

Hey 4rt45566, thanks for using Dropbox and posting on our Community!

Your calculations are about right, but keep in mind that if a single person downloads the file from your shared links more than once, it would also count towards your bandwidth limit. 

I hope this helps! 

What's the exact error you're getting 4rt45566? Could you post a screenshot perhaps? 

But when download from others source like google drive , i don't get any error like this.

Hey 4rt45566, are you downloading the files using the browser on your phone?

If these files are stored in your Dropbox account, can you use the Dropbox mobile app, to save them to your device, to see if you get the same behavior?

The opening of the files is done by the device itself, so, if its not opening then there is an issue with the software on the computer - does the machine have something to open it? 

Also in terms of your bandwidth remember that each 20mb file will have some basic overheads so you wouldnt be able to do 1000 but possibly a tad lower.