Dear AL EX!

Thank you very much for your greeting and quick response!
Based on your help, I realized there was a problem with adjusting the size.
I rewrote the command as follows:
imgmount c/storage/emulated/0/Win95.img -t hdd -fs fat -size 536,87,09,12
Now, when I open DosBox, the logo pops up and the program closes… Do you have any advice on this?