Below are some resources you can use to document your work, both for scanning drawings as well as photo/gif editing tools. 
1) Scanner app (Genius Scan) 
2) Gif maker (GIF Maker by Momento) 
https://ezgif.com/maker https://gifmaker.me/ 
3) Photo editor / Camera app (VSCO or Adobe PS Express) VSCO Link Adobe PS Express Link https://www.photopea.com/
 For photographing prototypes, we recommend everyone using a consistent white or black backdrop. Paper, sheets, walls/desks all work well for this.