quinoid-190123a.apk seems to still have the same problem here on Android 7, sorry.
Loaded wiki ok from local storage. Opened ok. Went back to list - filename still fullpathname. Exited quinoid. Reopened. File still in list but on opening got "The web page at file:///null could not be loaded because: net::ERR_FILE_NOT_FOUND" -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to tiddlywiki+unsubscr...@googlegroups.com. To post to this group, send email to tiddlywiki@googlegroups.com. Visit this group at https://groups.google.com/group/tiddlywiki. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/7a5e750f-e9e9-4d0e-95ac-04862abccb71%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.