A playlist can contain relative paths that are interpreted in relation to its location or source address. Moving the playlist without moving its referenced files can break those entries. This differs from a remote account failure and is especially relevant to personal local-media playlists.
Identify relative and complete addresses
A complete network URL includes its scheme and host. A local entry may instead name a file or subfolder relative to the playlist. The player needs enough context to resolve that reference; the filename alone does not tell it where a moved video now lives.
Keep local folder structure together
For an authorised personal-media collection, preserve the relationship between the playlist and referenced files when copying it. Test one entry after moving the folder. If a file picker grants access only to the playlist document, the app may still need supported access to the referenced media.
Do not rewrite service links casually
Remote subscription lists can use different address structures managed by the service. If those fail, request a supported current source rather than applying local-file assumptions. Keep a backup before editing paths and avoid exposing any credential-bearing addresses.