Walker

Currently the file name could not be the same when upload to Candidate Attachments, it would show this error message: This attachment has already been added to this candidate. Change...

The obsidian platform in the end is generated in wrong y places for MC 1.21

1

### Information * **Server version:** This server is running CraftBukkit version 4242-Spigot-0a642bd-515fe49 (MC: 1.21) (Implementing API version 1.21-R0.1-SNAPSHOT) * **Full output of `/mv version -p`:** https://paste.gg/p/anonymous/701c684147d64c7c9492ba7e1d3a51e3 * **Server log:** https://gist.github.com/KagefumiMerry/2e8384a4a70751bacace0e7f44012dc0...