I can't upload more than 19 medias

[Anke]

The aia size limit is

• 30 MB for http://ai2-test.appinventor.mit.edu/ and
• 50 MB for http://code.appinventor.mit.edu/

The maximum size of a file that can be uploaded to assets (→ Media) in the designer is 5 MB.
This can be circumvented by inserting the file into the assets using 7-Zip / WinRAR.

See also here:

Can't upload a .gif with a specific name

Btw, to upload multiple file to the assets:

Designer → Media / assets

<a class="lightbox" href="https://community.appinventor.mit.edu/uploads/default/original/3X/f/c/fc58e4d2659b42daf2c47acbdd24203c85c512f5.jpeg" data-download-href="https://community.appinventor.mit.edu/uploads/default/fc58e4d2659b42daf2c47acbdd24203c85c512f5" title="grafik">[grafik]</a>

This is easier and quicker and AdBlock doesn't matter. Note: The maximum aia size is now…

How do I select multiple photographs and upload in Media folder?

However, I prefer this method because there is no file size limit for certain types of files. This is an old post, so today the aia size limit is 30MB or 50MB for http://code.appinventor.mit.edu/#5303034247874286148.