no internal storage after custom rom

hello every one i have installed a custom ram ( nougats 7.1.2 Resurrection Remix ) for Condor A8 (Gionee s6s) and when i try to enter to internal storage via pc or with file manager i can't and it said "cannot find sd card" how to fix it
For info :
**i can see my files using recovery
**i have the original marhmallow and nougats 7.0 if there is a solution with sp flash tool**

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