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The issue likely stems from how Box Drive handles file streaming and path virtualization, which doesn’t always play nicely with libraries like OpenCV that expect direct, low-latency access to files. Box may be delaying file availability or hitting path length limits, especially when dealing with many files or deep directory structures. To work around it, try syncing the relevant folder for offline access so the files are stored locally, or move the dataset entirely out of Box Drive before processing. Also, keep file paths short and avoid special characters—Box and OpenCV both can get fussy with those.