Hi JanPoppe2018
Thank you for your post. When you email an invoice using MYOB, the PDF and link will be attached in the sent email.
There is an option to download a PDF from the invoicing screen, which can be attach to an email you prefer. Go to Sales >> Invoices >> select reference no. to open transactions >> select View PDF >> click on the link to open up the invoice >> select download PDF save to your desktop and attach to the email and send it to your clients. Kindly refer to the sample below:



Additionally, I'll provide this Help Article, Emailing, printing, or downloading invoices, that has detailed information to assist with this.
Please feel free to post again I'm happy to assist.
If my response has answered your enquiry please click "Accept as Solution" to assist other users find this information.
Cheers,
Princess