Attach a file in a form for the user to view

Use a!documentDownloadLink() function in a a!linkField function.

docs.appian.com/.../Link_Component.html
docs.appian.com/.../Document_Link_Component.html

use a!fileupload function to upload the documents and to only showcase the files, use a!documentDownloadLink() function

1.If the attached file is a snap of agreement then use imageFiled as below,
a!imageField(
images: a!documentImage(
document: id
)
)
2.If the file other than picture then give it to download as below
a!linkField(
links: a!documentDownloadLink(
label: fn!document(
id,
"name"
),
document: id
)
),

Based on your description, the "a!documentDownloadLink() function in a a!linkField function" sounds like the best option. A simple link in the right place to allow the user to download a file.

1. If you want a user to download the file than you can use

a!linkField(
label:"File",
links:{
a!documentdownloadlink(
document:docId
)
}
)

2. If you have to show the agreement to user than you have to create image for it and than you can use a!imagefield to show