Wi-Fi hotspot with access of device storage

Your question is not quite clear and I assume that you wanted to turn on Hotspot on your first device and connect to the Hotspot on your second device and access the Internal Storage of the first device.

What you could try is by using a File Manager app called "FX File Manager: The file manager with privacy" and it is available for download in the Google Play Store

Step 1:
Open up FX and navigate to the Web Access feature.

Step 2:
Turn on your Wi-Fi Hotspot

Step 3:
Turn on Web Access by pressing on the "Power On" button

Step 4:
A web "link" and a password will be displayed and you will need to type in this "link" on the second device (make sure you are connected to the first device's hotspot on your second device)

Step 5:
Enter the "link" displayed in Web Access and enter the password if prompted.

There you have it, you should have access to your first device's storage!