unfortunately not all region/item types support the refresh-action. From context help:
"Not all elements support a refresh action. You can use this action to refresh content in Interactive Reports, Classic Reports, and all item types with cascading LOV support."
So as a workaround you could redifine your region to be a (classical) report.
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when change references item value with out submit Page
Just selecting the image using the Choose File button doesn't upload the image to the database anyway. You have to submit the page to actually upload the image.
You can preview the file using FileReader:
but remember that the image is not stored in the database until you submit the page.
Many many thanks for kind your information.