Probably a newbie question about creating Android deployments

Even with the most basic sample get two different .apk files when packaged.

The first one, that starts “with AFS_”, gets stucked on the loading screen (I think that it is the loading screen).

Meanwhile the other one triggers this error
The application could not be installed: INSTALL_FAILED_NO_MATCHING_ABIS
if I run it on a x86 emulator or
Error while waiting for device: The emulator process for AVD Pixel_4_API_31_ARM has terminated.
On a ARM emulator.

If I run it on my physical device I get stucked on the loading screen as it happened on the emulator using the first apk and nothing seems to happen on the second one.

Thank you!