Since ImgPlay is an application for making GIF and short videos, it has no feature to add transitions.
If you want more various editing features including transitions, please try our new video editor app, VDIT!
VDIT - Video Editor
With VDIT, you can add special smooth transition effects to your photos or video clips and make awesome videos.
To make videos by merging photos, GIFs, Live Photos and videos, download VDIT now for free! It's super easy and simple!
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https://apps.apple.com/app/id1483410865