Hi,

 

For the UploadPersistedFile and the UploadAttachments , they will persist the files for only 1 hour.

 

If one hour have passed , the temporary files would be deleted.

 

 

Another condition is that the temporary files be deleted at server by unknown reasons .

 

 

Whatever reason the files be deleted , the controls would remove it from the list.

 

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Please check the source code of the advanced samples ,

 

It should how to use the UploadPersistedFile and UploadAttachments in a real scene.

 

 

Regards , Terry .