change propereties of a table which have filestream when a column would be added to it

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SQL

SQL-Server-2008R2

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Hi
i store files in db in sql server 2008 by filestream.
but when a column would be added to table which have filestream,
propereties of table would be changed. by every things change on table, retrive files will faced to error. but store process work probably.

and filestream filegroup at following address will be empty. why?


Right click on table --> properties --> storage --> filestream filegroup

Thanks