I can’t input Japanese in “Upload form”

Thank you for telling me about this issue.
It is now resolved in the newest release.
Please update and check.

I’m sorry
I can enter kanji, but I can’t enter hiragana and katakana.

漢字　　　　　OK
ひらがな　　　NG
カタカナ　　　NG

Please send me link to a form where you can’t enter it so I can analyze it.
In the upload form i tested, I am able to enter them.
Screenshot example:

View post on imgur.com

But maybe you mean some other input form.