I did point this out on the support page and have just received the following response-
Hi,
Thank you so much for your patience and for sharing those details with us. We really appreciate you taking the time to explain what’s been happening after the recent updates. We completely understand how frustrating it must be not being able to access photos and videos from your Secure Folder when uploading files through your browser.
Our technical experts have now reviewed your report, and they’ve confirmed that this issue is related to the Google DocumentsUI system, which manages how files are accessed and shared across apps. They’ve already registered this with Google’s issue tracker, so it can be investigated further on their end.
At the moment, we’re awaiting feedback from Google, and once they’ve completed their checks, our team will provide an update accordingly.
In the meantime, if you need to upload files, you may still be able to do so directly from within apps that have Secure Folder access or by moving the files temporarily out of Secure Folder (if you’re comfortable doing so).
Thank you again for your understanding and for bearing with us while we work with Google to get this resolved. If you need anything else, you can always press the "Ask Again" button, and we will be happy to assist you further. ^SK