Hi experts,
I have built a simple bot that I have connected to the Facebook Messenger channel. When I use the Messenger app on my phone to send an image to the bot, it stores the image on Facebook's servers and generates a URL for the image as expected. On the CAI webpage for my bot, when I go to the "Monitor" tab, I can see this URL generated by Facebook. A few days ago, when I sent the bot an image and visited this generated link, I could view the image perfectly and I got a 200 response from the server.

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-------------------------------------------------------------------------------------------------------------------------------------The images above show how the process should work. I send the bot an image, it receives it, I retrieve the generated URL from the "Monitor" tab in Conversational AI, and make a request to the URL using Postman to retrieve the image. Again, usually this is working just fine.
But recently, when taking a picture and generating a link and trying to visit it, I get the following error:
Bad URL timestamp
The response is returned with the HTTP status 403: Forbidden.
Any ideas why this could be happening?
Here is an example of a URL that I generated earlier this morning that does NOT work:
Here is an example of a WORKING URL generated a few days ago (6/20/19):
I have not done anything differently when sending these images to the chatbot through Messenger. This seems like it could just be a problem with Facebook's servers, so could somebody else confirm this or offer a suggestion?
Things I have tried and ruled out as the problem: