Again 4K movies but how?

I have a Huawei Mate 20 Pro and have always filmed with 4K quality. Suddenly banning with the cell phone but and if I set the setting is 720 pixels and I can't tap on the others. I also reset the settings. I can then select 4K but record it does only in HD quality and can be seen in the settings again 720 pixels are set. I still have 31.67 GB of 128 GB of storage. That should be enough, right?

How fast does your card process the data?

This is the storage space of the phone.

Maybe you have set a different frame rate. Set it to 25 or 30 and then try 4k.

or switch off the stabilizer if the phone has it.