unable to drag&drop an attachment with filename containing "+"

there is an error by drag&drop an attachment from finder when the filename contains “+”

I created a word document that was named “1+1.docx”.  I was able to drag and drop just fine and the email sent with no problem.  Are you getting an error message?

thanx for your reply. yes i got error message. could you please try this attached document? https://www.dropbox.com/s/kg0m42n4psgk2sh/rhp_bugatti19_volant_popisky_268%2Bcut.pdf?dl=0

Image is blank, but you seem to be using the Mac version?  I probably am not a good one to help you on this?  Did you update to the final release? https://emclient.com/release-history?os=mac