Need help with custom fields

So I have tried to incorporate custom fields by following the documentation but I can’t seem to get it working. Happy to pay to get this sorted and wondered if anyone could help?!

Hello there!
Hope you’re doing good

I can help with your requirement.

Kindly reach out to me at or skype me at live: luis_18439.

Hope to hear from you soon.

Have a nice day.

Thanks and Regards,

Hi there, i can say that custom fields working well, since 3.1 RC version. We have 3.6.2 snap installed now and still works.

by example, my custom fields: