bug#56499: 28.1; Unable to open large file

[Eli Zaretskii]

> Date: Tue, 12 Jul 2022 15:46:40 +0200
> From: Juan Jose Garcia Ripoll <juanjose.garcia.ripoll@csic.es>
> Cc: Eli Zaretskii <eliz@gnu.org>, 56499@debbugs.gnu.org
> 
> I tried evaluating find-file-name-handler as suggested and it returns nil. I 
> suspect it is due to OneDrive (and
> now also Nextcloud's) virtual files, which live online until requested. 
> Somehow opening the file does not
> trigger the required download.

Does the problem only happen with files that are not downloaded from
the cloud?  What if you tell OneDrive to download that file, then try
again -- does the problem go away then?