I am having trouble with an IF statement showing PDFs, here is the details:

My Data contains 2 fields: Letter and Gift Type.
Letter field will contain either A or B
Gift type will contain, renewal, additional or rejoin.

PDFs I have are A_other and B_other.

I want to trigger PDF “A_other” to print when the data Letter field contains “A” and the Gift Type field contains ”renew” or “additional” or “rejoin”

I want to trigger PDF “B_other” to print when the data Letter field contains “B” and the Gift Type field contains ”renew” or “additional” or “rejoin”

I need only one pdf to show at a time depending on the expression, can’t figure out how to code this in to an IF expression, assuming this would be the type of expression I should use.

This is an expression I can get to work but there is no "OR" options happening in it. I need the variables for "renewal", "aditional", "rejoin":
IF([Trigger_1]="A" AND [Gift_Type]= "Renewal", "A_other.pdf", "")

These are the expressions I have for the “A_other.pdf” and the “B other.pdf” that are not working

IF([Trigger_1]="A" AND [Gift_Type]= "renewal" OR [Gift_Type]= "additional" OR [Gift_Type]= "rejoin", "A_other.pdf", "")

IF([Trigger_1]="B" AND [Gift_Type]= rRenewal" OR [Gift_Type]= "additional" OR [Gift_Type]= "rejoin", "B_other.pdf", "")

Any help would be greatly appreciated.
Thanks,
Darren