Customized OAF page, uploaded files good, but file names missing intermittent

To upload receiving file，most time pictures，there are PO number, path, name, click upload, then insert table with data （po_header_id，po_release_id，file_id,file_name,file_data等），one data one time。issue：po_header_id，po_release_id inserted，but file name and ID (sequence) missing, intermittently. Frequently issue：file uploaded，file ID generated，but file name is null。

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OAF page is customized.
It is not cross module.  
table:     XXZZ_GODOWN_ENTRY_FILE_T
script:     SELECT UPLOAD_EO.ATTRIBUTE1,
       UPLOAD_EO.ATTRIBUTE2,
       UPLOAD_EO.ATTRIBUTE3,
       UPLOAD_EO.ATTRIBUTE4,
       UPLOAD_EO.ATTRIBUTE5,
       UPLOAD_EO.CREATED_BY,