Uploading compressed image(s) into CloudDB

[Iroha]

I'm developing an Instant Messaging app, and I met a problem while developing it-How to upload a user's profile picture.
At first, I used a method that users need to upload their profile pictures into a 3rd-party image sharing service, and paste the direct link into the app so the server will only store the link of the image, not the image itself, but this method may cause images not displaying or malicious things get injected into users' devices, like the image storing services' servers being down/got blocked in their countries/their internet providers' firewall/the image itself got deleted by the 3rd parties/the direct link got blocked, these can cause the images not displaying and the user inputting a malicious link can cause security problems since I have changed the image loading mechanism, the original image loading method that app inventor provides will freeze the app until the image is loaded, I want a smoother experience while using app even if the users' network were slow/having low bandwidth, so I used an extension (Extension to download a file to ASD (app-specific directory) without WRITE permission - Extensions - MIT App Inventor Community) that downloads the file into app's ASD to cache it for next time usage, then display the image stored in app's ASD using app inventor's prebuilt image loading method, but the problem is the extension accepts all files format from the internet, and it may cause problems, and the image URL method is inconvenient for most of users, so I want to use this method: uploading a compressed image into CloudDB, but I have no idea how to do this, I'm using a free Redis server plan that only provides 5MB of space, please tell me a way to do this on App Inventor, it will be very thankful.

[TIMAI2]

If you are using the AppInventor cloudDB blocks you have a couple of choices with images:

1. Convert the image to a base64 string and upload it as a part of the users profile information. You will need to decode the base64 string back to an image to display it in the app.

2. You can directly upload an image to cloudDB, but it has to be in its own tag, and you must use a full path to the file when you send it to cloudDB. Files returned are stored as new files each time they are accessed in a user folder called AppInventorBinaries.

If you keep your profile images size down (you can use a resize extension in the app), then you should have sufficient space for several hundred users, depending on what else is stored on the cloudDB server.

[Iroha]

I used Image to Base64 Extension here: Metricrat Extensions (metricrat-hosting.web.app) and the image displays partially, is this a compatibility issue with my device or is there anything wrong with my code?
Note

1. Device: Google Pixel 7(GVU6C) 128GB Model
2. Android Version: 14(UP1A.231005.007)
3. Action done on companion/complied app: Compiled app
   My AIA below.
   Base64Test.aia (11.3 KB)
   Screenshot
   
   
   
   Image used for testing
   
   Base64

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Update: this bug doesn't occur on Sony Xperia Z(C6603) Android 4.2.2(10.3.A.0.423)

[TIMAI2]

I do not recommend putting the base64 string to a label, this has been known to crash the app. Use a separate image component to view the image returned from base64 string (or a canvas without having to decode)

[Iroha]

Thanks, problem fixed with separating the output into a variable.
Base64Test (1).aia (11.7 KB)