Use Microflow for Opening the Page as in the screenshot below.
and keep the design as in below screenshot
You can see in below screenshot I'm able to add the Image (Browse option enabled)
Hi Chalermpohn Sununtawit,
how are you showing the NewEdit Page?
If you are showing it through microflow, then to get the file upload option enable,
you have to create an object of that image entity and get Form object associated with that image object (Because, without associated object it will not allow to modify the object).
Then it will work as expected.
Hope this helps.
Regards
Bhargav Ram Singh Bondili