I appreciate the update.
I was playing around with the dropzone / embedded upload function in 1.17 and I found that the situation is somewhat fixed, but it still isn’t very intuitive.
I was using .png and .pdf files in my tests. I didn’t have anything added to Additional Filetype Filters.
I found that in the Staff Panel, by default, one can attach both .png and .pdf files up to ~8MBs.
This is in spite of the fact that Agent Panel > Tickets > Ticket Settings and Options > Ticket Attachment Settings > Maximum File Size is set to 128 MB.
And in the Client Portal, by default, one can upload .png files up to ~1MB. But one cannot upload .pdf files at all.