I can not upload a file that has Japanese characters (double-byte characters) in the file name

[j-ed]

I’m personally not using Japanese characters in my file names, but a similar request related to the use of Chinese characters has been posted a couple of days ago and might give you a hint about the root cause of the problem:

Why can't Nextcloud upload files with Chinese names?

Chinese character is well supported. 一點兒問題也沒有. 一d 問題都冇. I keep the answer short to “respect” the question by intention.