How to replace document?

Question

User uploaded document "Accepting Task" which is being shown as a document link to download upon saving as shown in the below image. 
 If user tries to reupload an updated document, we want to update existing document with new version instead of creating multiple instances. 
 In order to use the document Id in the target to replace the document in folder, it is not a specific document id that we want to replace always. User can upload any number of documents and replace them. 
 If we delete the below "Accepting Task" document, it will not delete it from folder but just from database. We want to delete it from folder and create new one with what user uploads, or replace the existing document if the file name matches. how to achieve this? Please advise with a recipe.

Mike Schmitt · Accepted Answer

The only way to upload a new version of an already-uploaded document is to use that document's ID in the target of an upload field. You will probably need to do this in a separate spot from your multi-uploader, as Appian will have no way of knowing what uploaded files are supposed to be new versions of existing ones versus whole new documents.

ekanshj · Answer

Hi anushas0002, 
 You can have a remove icon adjacent to the download link of each document as shown in image. On click of that link the document will be removed from the link to download and stored in a variable. So when the user submits the UI you can handle the deletion of documents in that variable and delete it from DB as well as from the document folder.