Can’t open a .pdf file in a shared link.

I can’t open a pdf file from a sharedlink (iPhone). But I can view it with my another phone. I have tried many ways. Like logging out and deleting the app, rebooting my phone, logging in with another account. It still says ‘Couldn’t load the file’ with a cat on the background. It is a non downloadable link, just for viewing docs for work. I hope someone can help me.