Playing a downloaded movie or episode failed outright once the storage
holding it was gone — an SD card ejected, a USB volume unplugged, the
files deleted from outside the app (issue #2101). The item still played
fine from the server, but Plezy never tried: it committed to the local
copy and surfaced mpv's open failure.
Resolution already refused a missing local copy and let the caller
stream instead, but only for filesystem paths. SAF `content://` URIs
skipped the check on the premise that they are always playable as
written. They are not: an unmounted volume answers
`FileNotFoundException: No root for <volume>`, and a revoked grant is
just as dead, while the row still reads `completed`.
Probe the stored document through SAF before preferring it, so an
unreachable copy resolves to nothing and every consumer degrades the
way a missing file already did — the player streams, and both
external-player entry points launch against the server instead of a
dead URI.
close#2101
edde746
371eab8637