protonmail/mutt via hydroxide: Failing to attach pdf with current setting in mutt

[curiousgg]

when trying to attach a pdf on my local machine via mutt,
i get an error when pressing sending.

2025/01/01 x:x:51 ID@protonmail.com logged in
2025/01/01 x:x:51 creating draft message
2025/01/01 x:x:53 uploading message attachment "file.pdf"
2025/01/01 x:x:55 uploading message body
2025/01/01 x:x:00 sending message
2025/01/01 x:x:01 request failed: POST https://mail.proton.....: [2011] One or more attachments are missing a signature

is this normal? and is this related to my own set up in muttrc or hydroxide related?

[curiousgg]

also fails with simple .txt file attachment, not specific to pdf.

Possible duplicate of #272