Embedding images with links containing a query string, e.g. foo.com/attachments/token/sc1kod6qalzegkg/?name=sunset.jpg
results in weird-looking filename caption “?name=sunset.jpg”.
Maybe check for query string?
Do you have an actual example I can check?
It happens with img tags, for instance:
<img src="https://support.formlabs.com/attachments/token/8Arjif5NfwPnqcGgGD9LHBKn8/?name=P1020315_s.jpg">
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A generic fix would be to have the composer generate an alt property from the URL and change the lightbox to display that value as the image title instead – allowing users to enter a filename or description manually, if so desired.
We could try to regex out a filename, but that might be error prone too. At least the filename is in the querystring, so it is fairly clear what it is:
?name=P1020315_s.jpg