NodeJS deploy Heroku image upload error displayed - node.js

I have deployed a Nodejs application to Heroku, the cloud I use cloud mongoDB. The problem is that every time I upload a photo to post a post, the app only shows up for about 1 hour, then I re-download it, and the website fails to display the image again? Is it because I use the free Heroku package, everyone? Everyone help me please. This is my website https://myblog-nodejs-mongoose.herokuapp.com/

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