Email attachment names are wrong

Hi, we have a process model that sends email through EWS Send Email but the attachments names are all replaced by numbers which increase upon each sending.

For example test.txt gets sent as an attachment but with the name 10002603.txt. The content is fine but the attachment name will always be a number.

What could be the issue here ?

Before we were using the standard send email and the attachments were fine.

Also I figured the problem was with the EWS Send Email node, which has a parameter "attachments", and to see if it was the problem I removed this parameter expecting that no attachment would be sent, but they are being sent nonetheless which is more confusing because the only process running is this one, and to my knowledge an email can't be sent without EWS Send Email node (previously it was the standard send mail).

Any suggestion ?