I would like to know if I create a multi-file upload field and upload say 3 docu

Appian stores the documents in a system temp folder until the form is submitted. So you would need to create a submit button to submit the form, append the documents to a document array, and then loop back to the form to display the doc array contents in the grid. I would save the documents to a temp working folder until you are ready to officially submit the task (then move the contents to official case folder and clear the temp/working). Use the document() function to access document properties such as the document name and show that as the link label. Since you're showing it in a grid, use the apply function to iterate thru the document array. You can create a separate rule (to iterate with apply) which takes the document id and displays the property you want (file name). There is an APN rule which already does this for document name (see below).

So, for example,
a!gridTextColumn(
data: apply(rule!APN_getDocumentName,ri!documentArray_doc),
links:apply(a!documentDownloadLink(document:_),ri!documentArray_doc)
)

You could create other columns to show other properties of the file such as file type, created by, created on, etc...using rule!APN_getDocumentName as a template to create the rules to use in the apply() for each new column. I hope this answers your question.

Appian stores the documents in a system temp folder until the form is submitted. So you would need to create a submit button to submit the form, append the documents to a document array, and then loop back to the form to display the doc array contents in the grid. I would save the documents to a temp working folder until you are ready to officially submit the task (then move the contents to official case folder and clear the temp/working). Use the document() function to access document properties such as the document name and show that as the link label. Since you're showing it in a grid, use the apply function to iterate thru the document array. You can create a separate rule (to iterate with apply) which takes the document id and displays the property you want (file name). There is an APN rule which already does this for document name (see below).

So, for example,
a!gridTextColumn(
data: apply(rule!APN_getDocumentName,ri!documentArray_doc),
links:apply(a!documentDownloadLink(document:_),ri!documentArray_doc)
)

You could create other columns to show other properties of the file such as file type, created by, created on, etc...using rule!APN_getDocumentName as a template to create the rules to use in the apply() for each new column. I hope this answers your question.