Files are added in
"updateFileEntry" method in "com.liferay.portlet.documentlibrary.action.EditFileEntryAction" class
fileEntry = DLAppServiceUtil.addFileEntry(
repositoryId, folderId, sourceFileName, contentType, title,
description, changeLog, inputStream, size, serviceContext);
above code makes file entry, try to UPDATE same fileEntry Object by setting
public void setExtension(String extension);
public void setMimeType(String mimeType);
and using "updateDLFileEntry()" from "com.liferay.portlet.documentlibrary.service.DLFileEntryLocalServiceUtil" class
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