Why are single file options grayed out on iPad Air when sending files via WeTransfer?

Thanks for your reply - I tried different browsers, also I tried private or incognito mode, but without success. I didn't know there was an app, I'll check that out and see if it works better.

EDIT: Thank you so much, the app works!

Thanks for your prompt reply and for trying to help. I don’t get what you mean about selecting maps. I click ‘add files’ and the pop up that I screenshot appears, but I’m not able to add any files.

This is also true not only for iCloud but for any single files on my iPad. I can’t figure out why this is suddenly happening when everything has been fine for years.