Thank you, that was very useful.
I remove my extra fields and use that way, the problem that i have now is that the extra 2 fields i would like to be type='file' to upload an image and save the filename to the "extra1" field (the same as uploading image for property "image_link"
.
The reason why i want to create 2 more extra fields for uploading images is because i want the user to upload "Owner's Certificate" and "Proof of Value (Estimator)".
Thanks in advance.