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I have an array of maps and i should save the array in firebase database. when i do the update it remove the key and doesn't save

How can I save my array?

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I have solve .... this is my solution :

  remainingPhotos[position] = {  Key: originalPhotoArray[i], 
                                 Thumb: arrayPhotoThumb[i], 
                                 Title: titleArray[i], 
                                 Width: widthArray[i], 
                                 Height: heightArray[i]
                              };

For each element to add the element in json format and found!!

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