It is easy to make a new GIF/WebP or video file from an existing GIF/WebP or video file.
Just click the Edit button to open a file.
Or simply drag and drop a file.
For a video file, you can select the range to edit.
The Edit tab will appear once the file is opened. Now it's your turn to edit.
If you want to add an additional GIF/WebP/MP4 or video file to the opened file, just click + button in the left corner. In case the two GIF/WebP/MP4 or video files have different heights or widths, the height and width will be scaled to the same size as the first one.
If you want to insert it into a specified position, drag and drop a file onto the frame list where you want to insert it.
Once you're done, just click the Save button in the right corner.
In the Save dialog, simply select the format you want to save and click the Save button to finish.