Issue seems to be resolved by Cloudways, but I guess you have to contact support and let them do the modification.
Here is the statement
Can yu please check everything now and let me know if the issue is resolved as well the issue that’s current;y happening was because nextcloud app uploads files as .file and then try to move it to the relevant path. We at Cloudways dont allow any .extension files like .env, .htaccess to be directly accessible as this is a huge security risk that may cause issue. once the file was uploaded the nextcloud app was trying to move the .file file in the relevant directory with it’s relevant name hence we were getting 403 Forbidden. I have amend the rule on server to allow only .file and it seems to be working now please check and let us know if there is anything else required from us in this regards