Hi @DTS Engineer, Thank you for your assistance and support. Regarding the issue of a file being exclusively locked by Quick Look Extension Preview, I believe this might be an oversight. Here are some points to consider: Prior to macOS 15, the Quick Look Generator Preview functioned without this issue. However, the Quick Look Extension Preview exhibits this problem. In the Quick Look Extension system, thumbnail generation works without issue, but preview generation does not. As Alberto pointed out, text previews are unaffected, whereas image previews are impacted. Quick Look does not seem to require an exclusive lock on a file for reading purposes. Given these observations, it seems likely that the exclusive lock behavior in the Quick Look Extension Preview, when accessing files over SMB, in unintentional. If this is not an oversight, could you kindly explain why an exclusive lock is necessary in the Quick Look Extension Preview? This insight would help us better understand the situation and explore alternative solutions. Thank you again for your continued support! Best regards, Payne