Unfortunately I am not able to drop a file and get a tiddler with that particular file name. So I have given up on this idea.
I did make use of @mwiktowy DropCanonicalURI and adapted it to my needs. So now I can drop any link to create a tiddler with that name in it and appropriately tagged.
I mainly deal with -low volume- pdf files and images. All “wiki attachments” are stored in a dedicated folder in the same directory where the standalone tiddlywiki file resides. Opening up that folder in a browser makes it possible to drop any file link in the wiki.
Good enough for my -simple- purposes.
Thanks again for all the help.