You can schedule image or video posts to Reddit using Postpone. Below are the file limits for Reddit:
Reddit File Limits
Images
Supported file types:
- .jpeg or.jpg
- .png
- .webp
- .heic/.heif (Apple format)
Maximum file size: 20 MB
GIFs
Supported file types:
- .gif
Maximum file size: 100 MB
Videos
Supported file types:
- .mp4
- .mov
Maximum file size: 1 GB
