Why Won’t My TikTok Slideshow Post? (Common Fixes)

Updated October 21, 2026 · By the ViralSlides team

Short answer

If your TikTok slideshow won't post, check the photos first: no more than 35 (TikTok's limit as of October 2026), saved as JPEG rather than HEIC or huge PNGs, and ideally 1080x1920. If the photos are fine, use TikTok's own fixes: switch between Wi-Fi and mobile data, clear the app's cache, restart the app and your phone, and update TikTok.

A slideshow that won't post is usually a problem with the photos or with the app. Rule out the photos in a minute with the free slideshow checker, then work down the app fixes in order.

Steps

1
Count your photos
TikTok allows up to 35 photos per post. If you have more, cut the weakest or split the set into two posts.
2
Convert odd files to JPEG
HEIC photos from an iPhone, very large PNGs and screenshots in unusual sizes are the usual troublemakers. Export them as 1080x1920 JPEGs; the slideshow checker does it in your browser.
3
Switch between Wi-Fi and mobile data
A weak or filtered connection stalls uploads. This is the first step in TikTok's own troubleshooting list.
4
Clear TikTok's cache
Clear the app's cache in TikTok's settings, then open the post again.
5
Restart the app and your phone
Force-close TikTok, restart the phone, and try posting again.
6
Update TikTok
Install the latest version from the App Store or Google Play. TikTok lists this among its upload fixes.
7
Post from drafts
If it keeps failing at the last step, save the slideshow to drafts, then open the draft and post it once your connection is solid.
8
Check for an account restriction
If TikTok shows a notice that you can't post, the problem is the account, not the slideshow. Open the notice to see why; no change to the photos will fix it.

Is it the photos or the app?

If TikTok won't let you add more photos, or the editor shows them cropped or surrounded by empty space, it is the photos. If everything looks right and the upload hangs or fails when you tap Post, it is usually the app or the connection. Drop the set into the slideshow checker: if it says ready, skip straight to the app fixes.

Posting from a scheduler or the API

Tools that post for you use TikTok's Content Posting API, which is stricter than the app. As of October 2026, TikTok's developer documentation lists JPEG and WebP only, a maximum of 20 MB per image, images up to 1080p and up to 35 photos per post. A PNG or an oversized photo that the app takes can fail there. Depending on the posting mode the tool uses, the post may also arrive in your TikTok inbox for you to finish in the app instead of going live.

It posted, but it looks wrong

Empty bars around the photos mean they are not 9:16. Soft, blurry slides mean the photos are under 1080 pixels wide. Text hidden behind the like button or the caption means it sits outside TikTok's safe zone; the safe zone checker shows where it is safe to write.

FAQ

Why is my TikTok slideshow stuck on posting?

Usually the connection or the app. TikTok's Help Center suggests switching between Wi-Fi and mobile data, clearing the app's cache, restarting the app and your phone, and making sure you run the latest version.

Why can't I post photos on TikTok?

Check that you are in Photo mode with 35 or fewer photos, that the files are JPEGs your phone can open, and that TikTok is up to date. If TikTok shows a restriction notice, the account can't post right now whatever the photos are.

Can the image format stop a slideshow from posting?

It can, mainly with schedulers. TikTok's developer documentation lists JPEG and WebP for photo posts, with a 20 MB limit per image. Exporting everything as JPEG removes the question.

Do photos have to be 1080x1920 to post?

No. Other sizes post, but anything that isn't 9:16 won't fill the screen, and photos under 1080 pixels wide look soft.

Why did my scheduled slideshow land in my TikTok inbox?

Some tools send photo posts to your TikTok inbox so you can add a sound and post them in the app. That is one of the upload modes TikTok's API offers, not an error.

Sources

Platform limits checked on October 21, 2026.