Hi FHK,
Thanks for letting us know what's going on. It sounds like a total pain to have attachments vanish right as you hit send. I see you’ve already reached out to support and have a case open.
I know you're looking for a permanent fix rather than just a temporary workaround, especially since you have so many invoices to send out. However, saving the invoice as a PDF first and attaching it manually is your safest bet for now, even though I know it's an extra hassle. It might also be worth checking if this only happens with specific PDFs or a certain custom form template. Since we need to dig a bit deeper to find a permanent solution, keeping things moving with your current case is the best way to go. I’ll follow up with the team member handling your case to make sure we get this sorted for you. In the meantime, hopefully, some other members here can chime in if they've dealt with this same issue.
Cheers,
Princess
