I want do backup a Huawei P20 lite using its own "Backup" app. But it does not offer "Internal storage" as a backup location, even if it supports that, according to documentation here: PHONE BACKUP AND RESTORE GUIDE (see second screenshot there)
There is 44 GB of internal storage free (of 64GB total).
What is wrong?
I want to do a backup in the most hassle free way possible. There is no SD card at hand and have the slot used for the second SIM anyway.