I issued a strange behavior lately with High Sierra:
I wanted to store as a db file (sqlite) some data and the target folder was refused.
No problemo, I saved the data into the Downloadings folder and that was good. Then I moved my file into “Downloadings:Folder1:Folder2:Folder3:” and that was fine too.
It already happened yesterday, but I was too deep into what I was doing (modifyng that project) and let that to greek calendes…
Now, I get that too and I am starting to be curious / want to know why.
The project was built with Xojo 2015r1 (and I use it since… Mathusalem was a young boy ); I forgot f I was running it in the IDE or not yesterday.
BTW: before doing that, I deleted the previous build, quit all applications but Firefox (it have a download running), then I fired Xojo, loaded the project and build it without change.
LBN: I saved the original as .csv without trouble minutes ago into its proper location (with the previous build.