We can confirm this is expected behavior on the Reddit mobile app.

Reddit’s official apps have historically not supported sound on NSFW content or certain embedded files. This includes RedGIFs embeds.

Reddit explains this in their official FAQ:
https://www.reddit.com/r/help/wiki/faq/

Specific section on sound:
https://www.reddit.com/r/help/wiki/faq/#wiki_videos_on_the_app_do_not_have_sound._is_this_a_bug.3F

Some subreddits even add automated comments to remind users. Example:
https://www.reddit.com/r/tiktokporn
Example post:
https://www.reddit.com/r/tiktokporn/comments/yrawwa/tiktok_vs_reddit/

How Can I Hear the Sound on Mobile?

If you want to hear audio while browsing on Reddit mobile:

1. Tap the post source or link on the Reddit post
2. You will be redirected to RedGIFs
3. The content will play with sound as usual.

Does this affect the desktop?

No. Reddit desktop plays embedded RedGIFs content with sound without issues.

Still need help? Create a ticket or email us at support@redgifs.com with your concern.