Hi alex927,
welcome to the Apple Community!
Re: the iPad can’t calculate the file location and open it ... pls fix this as soon as possible
We are all Apple users, like yourself, in the community ... so no-one here has access to your accounts, details, or iPad etc. We'd like to help, however.
If you wish: Find files on your iPhone or iPad in the Files app - Apple Support
or
You can: Read PDFs in Books on iPad - Apple Support
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Re: iPad deleting files automatically
Wondering whether your iPad is short on storage space in which to operate smoothly:
See: How to check the storage on your iPhone and iPad - Apple Support
if so, it is a wise idea to back-up all your data, before making some space.
Eg: How to back up - Apple Support
Check out the article below for how to make space using recommendations:
If you need more space for an update on your iPhone, iPad or iPod touch - Apple Support
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Else: We do not know which iPad model you have, or which iPadOS version is installed.
You may want to check the iPadOS is up-to-date with the latest compatible version
(Eg: see if an update is waiting to be installed in Settings > General > Software update)
Else: If your iPad is already using the latest compatible version:
Try re-starting your iPad (deletes temporary files etc., re-establishes connections,
updates recent changes etc, and often restores order if something is not working as expected.
See how to: Restart your iPad - Apple Support
More trouble-shootiung if needed:
If you have any third-party (non-Apple) apps like ad-blockers, virus checkers, cleaners and the like (even VPN can cause issues) try turning them off (or uninstalling). See if the problem continues or not.
All the best :-)
