by Ken Task.
Are you sharing your experiences or asking for assistance/what to do?
One observation seen in what has been shared ... the file name itself:
In the xml: KOKMEN_STMS.pdf
In what was reported as an error - KOKMEN STMS.pdf - contains no underscore.
Also see this is related to mod_folder ... so it's a folder resource with only one file in it? Uhhhh, have to ask why use a folder for one file?
Probably need to query your DB looking at mdl_files table for the filename to see what's there. And then note the contenthash to find the file in /moodledata/filedir/
And in the future, consider naming files in all lower case with no spaces (use underscores dashes for spaces) *before* uploading them to Moodle.
'spirit of sharing', Ken