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I was able to get it working by using FileField instead of ImageField.
from mezzanine.core import fields
class Source(models.Model):
photo = fields.FileField("Image", upload_to="dir/", format="Image")
Digging through the code a bit, I found that Mezzanine’s ‘FileField’ is just an abstraction for filebrowser’s ‘FileBrowserField’ if it exists, otherwise it falls back to the default django FileField. I don’t know why they didn’t make it work for ImageField as well. FileBrowserField is smart enough to look it up from the media library, FileField is not. So you will also need to have filebrowser_safe installed.
Source:stackexchange.com