Why do images uploaded to Heroku disappear after one day? - heroku

I created a React App and its backend is hosted in Heroku. I can add images but after one day, those images are gone! I paid 7 dollars which is the hobby dyno. Should the images be stored in another service, or should I pay more money in Heroku?

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Heroku Eco Dynos Plan

I have three apps on heroku and currently they are unavailable maybe due to the newest update of paid plans in heroku. Now i want to pay. Do I have to pay for the three apps individually or one payment will cover the three apps.
I tried making payments but a bit confused so I need help in the right direction
If you subscribed to Eco dynos, one payment 5$ per month will cover them all. But it does not include databases if you have on Heroku. There you have to pay separately.

Heroku pipeline dynos and add-ons

I'm using Heroku's Pipeline feature to manage the stages of my application. I received an email about Heroku getting rid of their free plans, so I went ahead and upgraded my plan just now. Currently, I have one app with two database add-ons in Heroku. This is the first time that I've used their Pipeline feature—and I'm by no means a Heroku expert. I have two questions:
Do I need to purchase dynos for every new app that I use Heroku for? The plan that I ended up purchasing was the Production plan (since the app is for a client), and I also purchased two psql database add-ons which are attached to the app.
Since I'm using their pipeline for my one app, I have staging and prod versions of the app assigned to their appropriate branches in the repo. The prod app is where I upgraded to the paid plan. Do I need to purchase any dynos or add-ons for the staging app within the Pipeline? I was able to attach the databases with no issue, but I purchased a dyno for the staging app just to be safe.
Feel free to share any of your favorite Heroku alternatives as well—I'm only using Heroku because that's what I learned how to use in school.
Fellow Heroku user here!
Do I need to purchase dynos for every new app that I use Heroku for?
Yes. Heroku have basically said they’re getting rid of free plans for all applications due to wanting to make more money security reasons. So staging apps will also fall under this.
Basically, it sounds like there’s going to be no free tier dynos or first party add-ons from Heroku going forward. They do suggest for non-production apps (like testing and staging apps) to turn your dynos on when in use, and off when not in use, and you’ll only be billed for the time the dyno is on.
I‘m not sure which plan is the Production plan (I couldn’t see it on the pricing page) but maybe try out Hobby first. I have multiple apps running with paid Hobby-tier dynos and they have ran just fine without really spiking the CPU or memory available in those dynos. But I’m running PHP apps, so your milage may vary if you’re using another tech stack, or do get more load than my apps.

Why doesn't my free dyno hours decrease? (Picture included)

My question is "why my free dyno hours are not decreasing".
As the image below shows, I am using heroku to take cryptocurrencies price data from Binance via API. My python codes to use Binance is uploaded on github and deployed to heroku. The price data imported is sent to telegram, whose chatbot sends me messages.
Does anyone know why my free dyno hours are not decreasing?
My free dyno hour turns out to decrease, but it just takes time to get reflected on the dashboard.

Is it possible to run two applications on one hobby dyno?

I have $161 platform credits on heroku from GitHub student pack to spend for one hobby dyno:
The Heroku offer is for one (1) free Hobby Dyno for two years, which will be applied on your invoice as a discount of $7 for a Hobby Dyno.
I already deployed one spring app and changed its dyno to hobby. My question is if there is a way I could deploy second Java app and set it to use the same dyno which is assigned for the first app?
Right now I have one app which has hobby dyno and one app which uses free dyno. I read on the internet and people say that there is only one app allowed for one dyno and Heroku will charge me for the second one but there is also this thread How many apps are allowed on a 'Hobby' Heroku plan? which says that I can have more than one app per hobby dyno.
So what's the truth?
No, you can't run multiple apps on a single dyno.
Heroku's model is to run one app per dyno (and often many dynos for a single app). The question you reference discussed the Hobby plan¹, asking how many dynos can be run per account. Keep in mind that Heroku's model is different from the shared or VPS hosting you might be used to. Dynos don't provide an OS that you can put apps onto; they run apps directly.
¹Technically I don't think this makes a ton of sense since accounts don't have these kinds of tiers. One account can run free dynos, hobby dynos, and professional dynos. But there is a difference between unverified accounts, which can run up to five free dynos, and verified accounts which can run many more.
According to this article on the heroku page it is possible but not recommended.
Heroku post

Is it possible to upload 2 applications into the same heroku plan?

I am currently paying for a hobby heroku plan and I have already deployed an application, is it possible to have another application (different code and database) running in the same server as mine?
You can run as many Heroku apps as you want in your account. However, you need to configure each app to use either free or paid dynos, add-ons etc. independently.
So if you have a second app with different code and DB, you need to provision it separately with either free or paid plans. It will have its own URL, and will incur its own charges.

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