I haven’t looked into this issue in a while. I think disappearing files is some combination of user error and mapping file storage to my Azure Web App service which is configured using a Docker .yml file. I had a support ticket open with Azure support and they sent the following:
While mounting storage on App services Linux/container apps it does use blobfuse and it not recommended to do read-write operations as mentioned in below documentation
Source:
GitHub - Azure/azure-storage-fuse: A virtual file system adapter for Azure Blob storage · GitHub
For the most part, mounting file storage for images and files has been stable and I can recover files from backup if need be.