thanks! but I did the renaming with the good old crtl+f in the playlist 
took around 20 mins and I also removed 1 quiz game that I forgot 
now out of the 138 games in my collection, 113 have box/screen/titles. 20 left but maybe I can add them by hand with desktop menu tomorrow. As you said before I noticed some underscore that I think replaced the " / ", so I think I will modify some of those by also renaming the pngsā¦
Almost thereā¦
ok, using retroarch desktop mode I dragān dropped screeshots and titles from fbneo directory and got the remaining boxart from here this was kind of quick process because I didnāt miss many and my geolith playlist is āonlyā 138 games.
Now my playlist is complete 
In case someone need, I made a zip with the thumbnails, you can get them here. just place the SNK - Neo Geo folder in /retroarch_main_folder/thumbnails/
I didnāt rename the files (yet) so they should match the current db (same names as @thingsiplay playlist), in case they donāt just open desktop menu and drag and drop!
Renaming shouldnāt be necessary, as itās matching by checksum. This database, etc. is intended for use with the regular scanner, not the manual scan.
but I think the thumbnail updater does check the filenames because before renaming my files it didnāt download many arts but after renaming them I got most screens/boxarts.
@hunterk There is a setting which states it would download thumbnails by label, if its OFF. Maybe it fallsback to label, when no checksum is matching?
@Hari-82 Can you check if the following setting is ON or OFF for you: Settings > Playlists > Use Filenames for Thumbnail Matching (BTW for me it was ((and is)) OFF.)
Mine is OFF as well (never touched , I never notice it was a thing ).
Thatās weird isnāt it? for me it behaved like it was ON.
The database scan finds things by checksum and then puts the correct name in the playlist regardless of the filename. As long as the checksum matches, it will pull down the correct thumbnail. Now, tbf, this database isnāt 100% complete in that respect, but it should be ~80% complete. I havenāt gone through and compared against the existing thumbnails to make whatever weird character replacement rules are needed yet.
A lot of people just manual scan all the time, but it leads to exactly this issue of names not matching and having to do one-by-one corrections. The database scans exist to avoid all of that. If we can identify a game by its checksum, we already know everything about it, including what its proper name should be.
Arcade ROMs have historically been an exception to this because the same checksum can exist in many different databases (since the ROMs donāt frequently change). The DAT thing was added as a workaround for this problem, just to get them the right names (and, as a result, thumbnails).
This all relates to some of the key draws for Geolith core (beyond simplicity and accuracy): ROMs that never change and that have no overlap with other databases (i.e., true 1:1 matching), which allows it/them to function just like any regular olā console core, whereby you can do a database scan and get all of the goodies for the definitively identified ROMs.
How about the Playlist Thumbnails Updater? does it check for filename/labels/checksum or a mix of those?
Yesterday I also noticed that, after renaming a single file for testing, I went to the playlist (after a manual scan) and from the playlist itself I clicked on Download Thumbnail and it didnāt work, then went on and:
Online Updater -> Playlist Thumbnails Updater
and it did find the arts.
Historically, the thumbnail downloader has only checked the name as it appears in the playlist. Very recently, though, someone added a multi-part check that compares the playlist name first and then some variations, like omitting the stuff in parenthesis, etc. (I forget the particulars; I donāt use any of this stuff myself and donāt pay much attention to the PRs/commits).
Thatās true, but it boils down on trusting the database or the romset you have: in most cases, for me, I know I can trust the romset and doing a manual scan will add 100% of the items to the playlist while, sometimes, the normal scan will leave some of them behind. For example, no-intro have some updates and if the database is not based on the latest (or simply the same version) dat it will not add some roms. I do manual scans for some kind of āpeace of mindā , and I donāt do one by one changes also because the thumbnails updater works well enough. I did one by one changes for this particular set because is relatively small in my case because I did a curated collection.
