Yes you can.
Viewpost support attachments of the following file types:
| bmp | mp4 | Tif |
| csv | tiff | |
| doc | png | txt |
| docx | potx | wmv |
| dot | pps | xls |
| gif | ppsx | xlsx |
| html | ppt | xltx |
| jpeg | pptx | xml |
| jpg | prn | xps |
| mov | psd |
Can I Attach Files to Invoices?
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