Uploaded File lost on form resizing

[sidharth1917]

Hi isomorphic,
I am using FileItem for uploading file in a form. This form has a feature of collapse/expand. What's happening is, I upload a file then when I collapse/expand/resize the form, uploaded file is lost and it again says to upload the file. What can be the issue?

[Isomorphic]

This would not actually happen if you are using FileItem, but it would happen if you were actually using UploadItem. The docs for UploadItem tell you why this is, and tell you to use FileItem.