I downloaded several parts of a file that contains many parts, because I thought I already had most of this file from before and only needed the several parts I was missing.
After downloading, the complete file was still on the Transfers page seeding.
I noticed that the quality of the several files was a higher quality than I expected and better than the rest of the file I already had before I downloaded those missing parts. So I decided I wanted to download the whole file and all of its parts - except the several parts I'd already downloaded.
I restarted the torrent and attempted the action - Merge with local file and verify. I was unsure how to do this, since I had several local files I wanted to merge the restarted torrent with.
I tried merging the newly restarted torrent with one of the previously downloaded parts and with all of the previously downloaded parts. I tried it a number of ways, all of which failed.
On the Transfers page, the percentage of the file downloaded would go up by a couple of percentage points and then would go down to zero or nearly zero, as if the merging action failed.
I tried another way. I canceled the torrent and relaunched it again. I tried merging before "resuming" (when nothing had yet been downloaded and I couldn't see the files named), and I tried merging after "resuming" the download.
I tried merging the newly started torrent with all of the file parts I had, and I tried merging with just one part at a time.
-------------------------------------------------------------------------------------------
In another situation, a (non-torrent) file had completed to 100% and was stuck on "Verifying" for a long time when the computer was shut off. When the computer was restarted, the file was at zero percent downloaded. I tried the actions "Assume file is 100% and reverify" and then I tried "Forget current verification status and reverify", both of which failed to change anything.
I suspect these are two different problems, but I'm mentioning this second problem with the verification, in case the first issue above (re: Merging doesn't work) is failing because of a verification problem.
And re: the first problem above, I couldn't find any info on how to merge with multiple parts already downloaded.
Hari