please don't attach word docs of screenshots - just paste the images directly into your post
i show how to open blobs (including PDFs) here
if that preferences page is 'empty' something is wrong - check your log panel for error messages, and also, what version of SQL Developer are you running?
Thank you, Jeff, for your answer. How can I check the logs?
This is the empty list image:
I know how to open and download pdf from BLOBs, I do it in my SQL Developer every day, however, for some reason, in the user's PC, not mine, it is showing an empty list of mime types.
User's PC has the same version than mine, SQL Developer version 19.2.
View > Log panel
Also, 19.2 is a year+ old...