Android device connected to PC, detected, but no folder, no files

My previous Lenovo tablet with Android 7 had no problem with this procedure: 1. I connect it via a USB cable to a PC with Windows 7. 2. I select the device (tablet) in the Windows Explorer. 3. I open the (virtual) folder **“Internal shared storage”** (or the other, “SD Card”, as I had the SD card inserted in it, too). Then I sow directories and files on the tablet, and I was able to copy them from tablet to PC and vice versa, rename them, delete them, and so on. In my new tablet Lenovo with Android 11 and the same PC with Windows 7, I am able to perform only first 2 steps – then I see only an empty window, no folders in it (i.e., no “Internal shared storage” or other directory / file in it). When I try to copy a file to that empty folder, I obtain the message as > It is not possible to copy the item. > The device stopped to respond, or is disconnected. Is it something bad with settings? Is it possible to fix it? *Note:* I may go around and copy files from the tablet to the USB stick and then from the USB stick to the PC, but this is so annoying and slow… (The USB stick is connected with a short converting cable to the same USB port on the tablet as the USB cable connecting the tablet and PC in the previous step 1.)