Hi
I understand the frustration, but you have to share with us what you have, so we can help. Doing what you want is easy, so there has to be more to it then you are explaining and is why we need to see.
Taking data from one Table in an excel and adding it to another is not hard, so is the problem you cannot match the records, or you cannot find the files or you dont have keys, what exactly is blocking you?
You wrote
I have no issues with the flow to take an attachment from a mailbox and creating the document in the Teams channel. Likewise I have a workflow to copy the data from a single named Excel document and updating a master.
Ok this is good, but it makes it sound like you are doing this IN this flow, or is this just more information that you have done it before? This is why its confusing to just have long explanations and no pictures.
I think the problem is the different flows I have tried all want to source a single document and when I use document ID from a previous step I run into problems.
--let's try not to do this, it just gets in our head and can :-) confuse it, just tell us the issue hehe so we can help
What I have the challenge with is taking the data from the newly created documents and updating the master.
And its why I am confused. You said you know how to take data from a single file and add it to the master, so what exactly is blocking you, as you seem to have the knowledge you said.
So is the issue, that you have files that don't have tables in them so you dont what to do, or you put them in Teams and now you cannot access them or what?
Definitely can help but there is alot of noise in the post hehe (dont worry I do it too), but not really any specifics on what you are blocked BY.
Cheers,