From Synfig Studio :: Documentation
Pops up the Import Dialog.
From here you can import :
- Synfig files
- Image files.
The images are imported with its dimension unless you have "<Menu> → <Edit> → <Preferences> → <Misc.> → Scale New imported images to fit canvas" checked
- List files
- Audio files
- and .... even Videos!
Depending on what type of file you select, you can import images, videos (through pipe ffmpeg), SVG files, List Importer (.lst) files, etc.
See also other import scripts and options: