6019a39efa
Discord raised the default file upload limit from 10 MiB to 20 MiB for users, bots, webhooks and interaction responses (developer changelog, Sep 3 2026). The 25 MiB constant here predates the preflight salvage and never matched the platform; more importantly discord.py 2.7.1 still reports 10 MiB via guild.filesize_limit for unboosted guilds, so the guild-aware path under-reported the cap and rejected 10-20 MiB files Discord now accepts. Floor the guild value at the platform default so a stale library constant can only widen, never shrink, the preflight.