Cannot upload after updating site

Hi There. I’ve just updated my site and haven’t done anything different to what I normally do but there seems to be problems with the file names. Ab error message immediately appears that says “the file name is not allowed” I’ve changed the first file name that wouldn’t upload but another caused problems, any ideas as to the cause?
Error message:
Cannot upload file because the file name is not allowed[553 Could not create file.]
best wishes

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