Online collaboration tools (for example, Microsoft 365/OneDrive, Google Workspace/Drive) typically store documents in cloud storage and rely on a sync client to make those files appear locally on each device. If the user can't see the document on the laptop, the most direct remediation is to synchronize the remote (cloud) folder so the document downloads to the laptop and stays consistent across devices. The All-in-One guide explains that productivity platforms are "designed to be synchronized across multiple devices," allowing work to be paused on one device and resumed on another, and that many sync problems come down to configuration or a partial sync that leaves data not fully downloaded. It also notes that enabling/adjusting synchronization settings is often the fix. Quentin Docter similarly describes synced files becoming accessible through File Explorer once server/client synchronization is configured and highlights "Documents" as a common sync data type. Mike Meyers reinforces that file services like OneDrive/Google Drive use an installed app on each device to specify what gets synchronized.
References: Quentin Docter - CompTIA A+ Complete Study Guide (syncing files/data and documents); Travis Everett & Andrew Hutz - CompTIA A+ All-in-One Exam Guide (cross-platform productivity sync and synchronization issues); Mark Soper - Mike Meyers' A+ Lab Manual (file transfer/sync services and per- device sync apps).