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I mistakenly deleted some messages on my oppo cloud account and I really need them back. They’re very very very very very important.

You’ll need to speak with OPPO directly, as we can’t help you as the issue is within their systems not your phone (cloud account). OPPO Support

Dear friend when you deleted any thing in your cloud storage they did not deleted permanently…..data goes to deleted recycle-bin…..so go and check hopefully u find there…….my deleted all items i can see there…..