sorry if wrong section or unlogic question.

so i have use wasap since 2017. registered using a gmail account (free 15gb)
lately 90% used up. so i deleted email spam, sent, thrash. still 70% used up.

if used up 100% then have to pay monthly for extra gb. if use new gmail, then all prev wasap gone right?

You can change backup settings to use another Gmail. However previous backups will be there in old Gmail. You will need to do backup again into new Gmail manually

so my question:

- besides gmail, gdrive, google photos, does any wasap content (chat texts, pics, contacts) used up gmail account storage?
Only Backup files of WhatsApp will used up Gmail drive storage

- if back then if i registered wasap under yahoo mail 1tb storage, wsap content will use yahoo account right?
Not possible to use yahoo as backup, yahoo doesn't have cloud drive unlike Gmail or Microsoft

- or wasap only can be registered under gmail?
If you're confused, wasap usually is registered using phone number, not email. Gmail is used solely for backup purpose

noted thanks. i don't mind paying one time for gmail added storage like maybe 5gb for rm20. but rm8.50 monthly? for 100gb that i'm not going to use that much. even the 15gb took 5 years long to 90% full