To upload a Custom Vid in order to fulfill an order, upload the vid as you normally would (for assistance with this, follow the steps outlined in our "How do I upload a Vid?" article).
The vid will go through the upload process, and when ready to be edited click the <Launch> option.
Scroll down and select the 'Custom Vid' option and the username of the member the custom vid is for.
By default, the vid will not publish to your page and will only be available for the purchasing member, but if you want to also publish the vid to your profile for purchase by others, scroll back up and select 'Launch right away!' under the 'Available on MV' section.
When all the details are added, click <Save> at the bottom. The vid will be sent to the member directly and the funds for the Custom Vid will enter your earnings!