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Here in the first image I have given a field update so that my 'Requested by' field has to be updated to the person who requests for the approval.But here instead of getting the user who requests I have only an option to give one user's name manually.
I have to update it to the person who requests for the approval be it anyone.
Should I use any automation tools for this-process builder or screen flow for this?
What is the purpose of capturing Initial Submitter in a Lookup field?
If its just for reporting purpose, you can use reports and fetch those details there
Or if you want to capture just the name you can go with a Text field and while updating the field you can opt for a formula editor and update with User> User.Name instead.
Or, if you want the User look-up instead of a text field I guess that cannot be done using a field update on Submission actions. Instead go with a Flow/Process Builder on Submission(you have to update another field so you can trigger your Flow and make sure "Re-evaluate Workflow Rules after Field Change" is checked). You can check this link for flow/process builder RecordTriggerAutolaunched flow Not firing
