Thanks! Yes, it is working for me in dropbox. Looks like it is the only way to link images from external hosting these times.
Let me just write a brief tutorial how to change the dropbox link of updated image in order to work in listings in geocaching.com:
Example1: https://www.dropbox.com/scl/fi/XXXXXX/example.png?rlkey=XXXXXX&raw=1
You should replace the original dl=0 to raw=1 on the end of the link
But... I was also trying this on TB listings, but I found out, that the ampersand in TB listings is rewrited to something like & after you make changes. So the Example1 works only for GC listings, not for TB ones.
In order to display some dropbox uploaded image in TB listings, I found out another rewrited format of dropbox HTML linking and it works for me. See 'Example2', which works for TB listings.
Example2: https://dl.dropbox.com/scl/fi/XXXXXX/example.png?rlkey=XXXXXX
So we actually wanted to delete the ampersand in order to work for TB listings.
And also, you should replace www to dl in order to work.
This TB linking format should also work for GC listings.
Have a nice day.