You may get a message that says "1s Movie could not be processed" when trying to create a new 1s Movie. The most likely reason is that the 1s Movie included a photo or video that is no longer available for use. If this happens, you will need to edit the 1s Movie again. Please see How do I edit my 1s Movies? for instructions on how to do so.
After receiving the message above, the photo or video which is unavailable will not appear on the list of selected photos/videos or on the list of possible replacements. It cannot be added back into your 1s Movie the next time you edit it. Please select a different photo or video uploaded during the relevant time period to replace the one which is unavailable.