File size upload validation

I accidentally tried to upload a 10MB image file. The upload failed.

Question #1: What is the max. upload file size allowed?
Question #2: How to set the max. file size the user is allowed to upload, and if it exceeds, to display a message that the maximum allowable file size is __MB?

You can set the max upload size in your php.ini file on your server.

Noted about setting the php.ini file. But it is still important to sort out the front-end user experience.
Currently, the form will reset itself if the file exceeds the max upload size. The user will mis-interpret it as a successful form submission.

1. How to validate for max upload size and show an error message?
2. How to prevent a form reset if the submit button is clicked?

Really need your help. Thanks!

You can use server validation with integer validation to validate the value of:
<?php echo((isset($_FILES["uploadFieldName"]))?$_FILES["uploadFieldName"]["size"]:"") ?>

I think if it is over the max size it will have a value of the max size, so just check that the number is less than that (in bytes)

You can use the "Validated Form" bindings to re-populate the form when the validation fails.

I have the same question and try to do as you write but I can't find "Integer" in server validation. Do you perhaps mean "Number" or "Entry Length"? In that case, this means that I have to choose width and height, which I don't want. I want a maximum file size. It seems to be a fairly common question on this forum - so it would be great if there was a tutorial or guide on how to do it.

You can do number validation on the size, which is the file size. You don't have to do width and height, but you could do those separately as well.