Open the Settings App on your phone.
Type USB into the search box in the phones settings app.
Ensure that USB is set to File Sharing or MTP.
Then in Windows, open the Settings App.
Go to Bluetooth and Devices - AutoPlay
Set Removable Devices to open File Explorer or 'Ask me every time' when they are connected.
Then connect your phone to your PC to check if you can then see the storage on your phone in File Explorer.