How can I validate the document uploaded by user and disable the upload button if there is error with the document

Question

Hi, 
 
 I need to have a document upload form like this package import form, and have a validate button like inspect button, but I need to disable the import button before the document is validated successfully. 
 I need to validate the document's content and format, so it's not just a validation for the size and type 
 How can I do?

Stefan Helzle · Accepted Answer

Submit the form, validate in-process and show the result in a second user input task. Enable activity chaining to make this a seamless experience for the user.

baji mekala · Answer

Hi fxzrqjzztrmy 
 Agree with Stefan Helzle solution is easier and works for me. 
 Right now we are uploading Excel documents, Once user submit the form and validate in process through Stored Procedure and displaying results in second form and at the end of the process we remove the uploaded documents. 
 We don't have go back option once user has to close the user input task and open a new form to upload

Kumar Agniwesh · Answer

You can have a back button which takes the user to new form which is activity chained, so that users are taken to interface which let users upload the document. Only thing is that you would need to clear the data collected till now.

How can I validate the document uploaded by user and disable the upload button if there is error with the document

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