Problem import/export documents references

Hello,

We have found a problem importing a complete organization of an instance (A) of Liferay into another instance (C) of Liferay. References to documents from the document library or from web content pages in instance A are not updated in instance C.
The problem appears when identifier of documents in C continues to maintain the same identifier of A, giving error when trying to access the document in organization C. Above, this problem does not always happen, only appear sometimes.

We need to locate this behaviour to know the reason because documents references are not updated correctly in organization content import process. Thank you very much in advance for everything.
please help.
Thanks.
How To Video