Apple Mail won't send attachments in email.

Apple Mail has suddenly stopped sending attachments in email. Whether I drop the attachment into the email or choose a file with the paper clip, all it shows is the file is downloading but never attaches to the email. I tried attaching documents in safe mode and that works but when I restart in normal mode, it goes back to not attaching documents to emails. I have just updated to Sonoma 14.4 but it was happening before the update. Help.