storagePath() is synchronous — need async support

[codeonprod]

Hi,
I’m using ostrio:files in a Meteor project and ran into a limitation regarding storagePath().

Current behavior

storagePath() is called synchronously, which makes it impossible to compute the value using asynchronous operations.

Example use cases where async is required:

• Fetching storage directory from an external API/microservice
• Reading path from a database
• Using dynamic per-user storage resolution that requires async lookups
• Awaiting cloud / remote mount status before determining path

Right now, returning a Promise or using async/await inside storagePath() does not work — the function must return a string immediately.

Impact

This prevents:

• Multi-tenant storage routing
• User-specific or organization-specific folders resolved from DB
• Integration with remote storage services that determine the directory dynamically
• Compatibility with applications where storage rules are not fully known at startup

Desired behavior

Allow storagePath() to be asynchronous.

Example idea:

new FilesCollection({
  storagePath: async (fileObj) => {
    const dir = await getBucketFromDB(fileObj.userId);
    return `/mnt/data/${dir}`;
  }
});