I am generating vouchers automatically, with the command
/user-manager/user/generate-voucher voucher-template=printable_vouchers.html
I customized printable_vouchers.html, but every time mikrotik restarts everything returns to default in the um5files folder which is in the root of the RB750gr3.
I changed the folder to the hostpot path but it didn't help, I need printable_vouchers.html to keep the config that I put in it, does anyone have any ideas?

well first look for the obvious, check your disk space