host migration problem

hello, yesturday the hosting company wich my social network is hoting in ve changed the machines , so after the migration , the contenet of the folder where data are stored is safe but when i enter my social network it doesnt load data from the data folder, i.e the The full path to the directory where uploaded files will be stored, followed by a trailing slash is correct but no data loading from it , how to slove this prb
thak you in advance