How to get image metadata on publisher?

Hi all,

I tried get metadata of an image on publisher but it can not.

Example:

http://localhost:4503/api/assets/lyf/logo.png.json

In the author 4502 I can get metadata.

"properties": {
"metadata": {
"fr_alt_text": "French Alt Text",
"dc:modified": "2017-10-05T09:55:35.478+07:00",
"zh_alt_text": "Chinese alt text",
"dc:format": "image/png",
"en_alt_text": "English alt text"
}

In the publisher 4503 it can't get metadat.

"properties": {
"metadata": {

}

}

Please help me,

How to get image metadata on publisher?

Thank you so much,

BienHV