The phrase "I seem to recall..." means that you think that you remember something. You can use this phrase if you're not sure about what you remember:
I seem to recall him telling me about some video game that he was into, but I don't remember which one.
You can also use "I seem to recall..." when you are sure about what you remember, but it seems like other people have forgotten it:
I seem to recall you telling me that you were going to send me those pictures. What happened to that?