Back in March 2021, I created my own collection "Thought Provocateur Extreme Extraordinaire Artworks". Then, I created 2 NFTs and put them into this collection. Since then, I created more and more NFTs (December 2021, September 2022, June 2023), and I was able to put them into this collection.
When I wanted to create more NFTs and put them into the same collection in March 2024, I was unable to do so because "Choose a collection" cannot be found in OpenSea's drop-down menu.
Please note that I followed the instructions in "How do I create an NFT?" What is going on? HELP!!!