To add attachments to a purchase, go into the purchase, go to the Attachments subtab.

Click Choose and select all the files to upload.
​

After attaching the attachment, you can edit the name and name the file to your needs.

Note: Only .csv, .xls, .xlsx .xlx, .odt, .doc, .docx, .jpg, .jpeg, .png, and .pdf are supported. File size must not exceede 5MB.