Do you mean SamsungOS or /e/OS ?
the vbmeta.img file is an image of the /VBMETA partition
the recovery.img file is an image of the /RECOVERY partition
I do not see divergence here, the “official documentation” only describe the sideload method, when the “unified guide” also talk about local install (from internal storage that is not possible on all device using the recovery-e)
sorry, I do not understand any of this.
“factory reset” leads to
what you call a “file manager pops up” results of the “apply update” → “from internal storage”, it ask for the e-2.8-a14-20250221470208-community-gta4lwifi.zip to install it on the system…

