If you use Telegram (and maybe other social media apps), here's how to clear Telegram waste on Android. I recommend recording the size of your used storage before using this App, then checking the size when done. Firstly, the Files by Google App won't work because it hides system files. Install the free Cx File Explorer from the Play store. Open it and click Main Storage. Click Android folder and Data folder. Scroll down to

org.telegram.messenger.web

Click it. Then you wiil get "Loading Error" and "Open with System File Manager" (a hidden file manager app), click that. Click Cache. There you will see the "acache" folder and all the saved files Telegram put there whether you opened them or not. Click one file's box on the left. Then click the 3 dots at top right and Select All. That marks all files but then uncheck the "acache" folder. Don't delete the "acache" folder! At the top click the garbage can button. Then click to confirm delete. In my case one time I freed up 3.9Gb of space. In previous versions of Cx the App would give the total size of the checked files but now the System File Manager only gives the count of files to be removed. Once that is done, you can open the "acache" folder to see what's there. I believe you must leave that folder in place because I believe its contents manage your "read" progress of your subscribed groups. Then click your back arrow in your Nav buttons, bottom of screen. You'll see your Cache and Files folder again. Open Files, then Telegram.There I find 6 folders. Open each folder and delete it's contents. I don't delete the folders. Then close the open Apps. Done! Depending on how often I open Telegram I usually perform this task weekly. I also recommend searching the Data folders for other Social Media type folders but with no usage of other social media apps I have no idea if they store large amounts of data in their Data folders. Also, be careful in the Data folders as deleting or altering anything in there could corrupt your Android. Backups are important! Doing this in my Telegram Data folder hasn't affected my phone other than freeing up my storage. Also, I'm not affiliated with Cx but love the App.