New Bug Encountered: Constructing an Attachment File URL stopped working

hi,
the below is a sample of a construction that has been working for weeks.
but today it is not for any link constructed! the file, folder, APP, all exist, i can browse to it and open the pdf.

https://www.appsheet.com/template/getappfileurl?appName=TESO-751991&fileName=Attachments%2FDOCKET%20ShArt.200501.1.pdf

sorry, but urgent.
thanks

Another similar to this issue?

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Exactly!

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Yes your constructed URL does not have a signature which now required as an additional security protection. If you need this construction to continue to work, you can turn off the new security feature by going to Security -> Options and disabling the “Require Image and File URL Signing” for your app TESO-751991.

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