I am super sorry but I am not following. I mean I sort of get what you are saying, but the details are... a bit confusing. Let me try to break it down and hopefully I can help.
Firstly, what is your Datasource, you do not mention, so when speaking of options, its different in Dataverse versus SharePoint versus other platforms.
I'm trying to create a "Valid to" date to show a date of when a document has to be reviewed agian. Like a timer.
--Logistically this makes sense, you want a column that can be checked (potentially) but a scheduled flow, on a daily basis to see if this date is hit, or within the range you want to check on. I think
I have a release date made in Power Automate which takes the date of "Publish" and puts it in.
--Takes the date from where?
--Puts it in where (it doesn't say)
I want to use that column with a choice column "Validity" (2 options, 12 months or 24 months).
--What column again you didn't say, what data type is it?
--What does I want to use that "Column" with the choice mean? Are you saying based on some business logic combined with the New Column value, you want to set the choice to either 12 months or 24 months?
I cant just do a calculated column since it wont show in Quick Parts.
--not sure what this means
So i've been trying to use Power Automate but I'm lost.
I cant figure out the correct condition, I've tried to use when Validity and Release date is NOT empty, run flow.
But it wont work and when it does, it wont show if i have chosen 24 months.
--Please share your flow, with all steps open and all your inputs etc showing.
----As for the line I made bigger, I do not understand. You say condition, but then you speak of a Trigger.
----Are you saying that when someone creates a new record (in whatever storage you are talking about), and if those dates are empty, you want the flow to run?
----But then you go back to a condition statement
Apologies but its really not clear what you need but I did my best to make an educated guess, but you have to share in better details (think of it in steps not a paragraph), of what you want
1. Person creates a record in SharePoint using a Form
2. I want my flow to trigger
3. I want the flow to check bla bla
then do bla bla
Like that.
Also share what you have so if its close we can help you fix it.