3 Ways to Fix Slack Not Uploading Images (iPhone and Android)

Quick Tips

• You can’t upload images and media to Slack if there’s a problem with your internet connection.
• Enable auto-start (Android) and Background App Refresh (iPhone) to ensure Slack uploads images even after you exit the app.
• If nothing works, you can always try to clear the cache from Slack or re-install the app.

Basic Fixes

• Check Slack servers: If Slack’s servers are down, you may not be able to upload images. So, check the server status of Slack, and if it says that it is down, wait for Slack to fix it.
• Check network connectivity: Ensure your device is connected to a stable cellular/Wi-Fi network.
• Don’t exit the app before the file is uploaded: Slack may have an issue with running a few processes in the background. Do not exit the app before the image is fully uploaded to the chat.
• Reinstall Slack: Reinstalling Slack removes any corrupt app files or elements, and a fresh installation will likely fix any issues.

Fix 1: Clear Slack Cache

Accumulated cache and junk files can cause issues, such as Slack not uploading images and media. Here’s how to clear the cache.

On iPhone

Offloading an application on your iPhone removes cache and junk files. Don’t worry, it won’t remove any app data or sign you out from Slack.

Step 1: On your iPhone, go to Settings > General > tap on iPhone Storage.

Step 2: Scroll down, select Slack, and tap on Offload App. Tap on the Offload App once again to confirm your action.

Step 3: Now, tap on Reinstall App.

On Android

Step 1: Long-press on the Slack app icon in the app drawer and tap on App Info.

Step 3: In the next window, tap on Clear Data > Clear Cache.

Fix 2: Disable Low Data Mode

If you have the Data Saver enabled on your phone, we suggest turning it off so that it does not restrict any image or media upload on Slack under the pretext of saving data.

On iPhone

Step 1: Open Settings > tap on Cellular Data/Mobile data.

Step 2: Tap on Mobile Data Options (or Cellular Data Options).

Step 3: Tap on Data Mode. Ensure you haven’t selected Low Data Mode. Select Allow More Data on 5G or Standard.

Additionally, ensure you’ve not enabled Low Data Mode for Wi-Fi networks as well. Open the Settings app > tap on Wi-Fi > tap on the info icon next to the connected network > turn off the toggle for Low Data Mode.

On Android

Open the Settings app > go to Network & Internet > ensure you have not enabled the toggle for Use Data Saver.

Fix 3: Enable Autostart or Background App Refresh

If Slack has issues uploading images and media in the background, enabling Background App Refresh (iPhone) or Autostart (Android) can help the app complete tasks even after exiting the app.

On iPhone

Step 1: Open the Settings app > tap on General. Tap on Background App Refresh and select Background App Refresh again.

Step 2: Select the Wi-Fi & Mobile Data option to enable Background App Refresh on all network modes.

Step 3: Go back to the Background App Refresh menu, scroll down, and check whether you have it enabled for Slack individually, too.

On Android

Step 1: Long-press on the Slack app icon in the app drawer.

Step 2: Tap on App Info.

Step 3: Turn on the toggle for Autostart.