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Have a look under Tools > Site Health. I suspect you will see a warning there about the disk space in your hosting. Either the directory and file permissions are incorrect or the storage space is full.
Thanks. Disk space is good, but there is a notice about not being able to access the filesystem:
“Unable to connect to the filesystem. Please confirm your credentials.”
No more specifics though, and I’m not quite sure where to begin as I haven’t changed any permissions or made any other changes in the past few weeks?
Permissions can also be changed by the hoster by updating the server. I would recommend that you contact their support.
I will try that, thank you!