How do I store pictures in iCloud forever?

You're right Demo.

I assumed the OP was using iCloud Photos only, or both iCloud Photos and Photo Stream. Should be my assumption, perhaps this support guide could help the OP:--> About iCloud Photos and My Photo Stream - Apple Support

Thanks for your clarification :), have a great day.

Giulio

It sounds like you are talking about Photo Stream. Photos are stored there for 30 days and then deleted from your devices and iCloud.

My Photo Stream - Apple Support

iCloud is not permanent storage nor is it true off device storage. iCloud is really a syncing service, not archival storage.

Forever is a "big" word, but yes they'll stay there until you are signed into your iCloud Apple ID, unless you delete them.

How and when did you get a message that your pictures will stay ther for 30days only?

Regards

Giulio

I am making an assumption as well. You have a wonderful day as well. :)

:-)