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- Release builds now sign with a dedicated keystore (local android/key.properties or CI secrets, both gitignored) instead of each machine's own debug key, so a downloaded release APK can actually update a previous install instead of failing with "App not installed" (mismatched signature). - The Files tab's "+" -> "Upload File" now goes through the same ShareUploadView destination picker and background foreground-service upload as receiving a file via Android's "Share to..." sheet, instead of a separate blocking in-app-only upload path. Removed the now-unused ServerProvider/NextcloudService.uploadFileFromPath. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>