no archive folder on iPad air mail

Before the IOS 26 update I had an archive folder on my primary mail account. its not one of the big providers and I've had this trouble before. I did a search and tried to follow the instructions to recover the folder but none of them worked and I do like to store things in that folder. There's an archive folder for my gmail and icloud accounts but not my telebyte one which is my primary mail account. there is still one on my iPhone so not sure what the problem is. can anyone tell me how to get the folder back please.