You may need to upload more than one Proof of Work document to satisfy all the criteria of an acceptable document, as this may differ for some contracting companies.
There are various file types you can upload your documents such as PDF, JPEG, PNG, GIF or TIFF.
You can upload up to five Proof Of Work Documents per payout. To upload more than one Proof of Work document:
Long press the image you'd like to upload until a checkmark icon appears.
Slide your finger up and down to auto-scroll and select additional images.