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Writing to subfolders

I can create subfolders on my s10+, however copying files to such subfolders is not being allowed. Thus, the ability to create subfolders serves almost no value.

How to fix this problem?
 
If you're able to create a subfolder you obviously are doing so inside a folder that has the necessary 'permissions' setting for that folder, so yeah this should also allow you to copy/move/edit files involving that subfolder.
But how are you going about doing all these file/folder tasks? Is this happening when using a file manager app on your S10 Plus? Or indirectly while your phone is connected to something like a Windows PC? If a file manager app, which one and is this involving the internal storage or a microSD card? Check that the app's 'Permissions' is set up correctly:
https://www.howtogeek.com/230683/how-to-manage-app-permissions-on-android-6.0/
If you're doing this indirectly over a USB cable and using something like Windows Explorer on a Win PC or Finder on OS X/MacOS than don't forget that neither Windows nor OS X/MacOS use the same file system that your phone is using (ext4). Things like file/folder permissions and file metadata are iffy, half-measures when it involves interactions between different platforms.
Whatever the case, it might help if you can provide more details.
 
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