Portability depends on export access, supported formats and enough information to interpret the exported material. A file that can be downloaded may still require conversion or lack features needed by another application.
For generated media or other digital work, retaining suitable exports can reduce dependence on one service. Technical portability does not establish ownership or permission to use the material for every purpose.
ELI5
Think of being able to take your work with you when moving from one tool to another.
For example, exporting a project in a supported format helps you open or reuse it elsewhere instead of relying only on access to the original website.
Is any download fully portable?
Not necessarily. Another system may be unable to read its format or may need information the export does not include.
Does portability settle licensing?
No. Being able to move a file is separate from having permission to reuse or distribute its contents.
