If you own an Android 5.1 device, safer alternatives include:
Search for the exact file named tiktok_android5.1_new_v36.2.4.apk (or the latest version number). Ensure the file size matches the official release (approximately 80–90MB). Do not download any APK under 50MB—those are often fake. tiktok apk for android 51 new
Android 5.1 (Lollipop) users looking for the latest TikTok experience, the most stable and feature-complete option is TikTok Lite If you own an Android 5
Here you'll find all collections you've created before.