My LINE Desktop not appear images when linebot reply image

[Paranchai-C]

when my linebot reply image message on LINE moblie image is appear but LINE Desktop it's not. when i use url image on internet it's appear both. What can i do to fix it?

//i use ngrok to connect with line webhook

############# reply code section ######################################
elif text == 'image':
url = request.url_root + '/static/logo.png'
#url = url.replace("http", "https")
app.logger.info("url=" + url)
line_bot_api.reply_message(
ReplyMessageRequest(
reply_token=event.reply_token,
messages=[
ImageMessage(original_content_url=url, preview_image_url=url)
]
)
)
##################################################################