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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?
 
Depends on what file manager you are using.
Solid explorer, XPlore, and many others in the play store can do this without issues
 
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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