Project failing to export. Animation too Intricate for Adobe Animate?

I'm working on an animation project that is quite intricate.  It is complicated, with many symbols and layers... But it's organised and it's as complicated as it needs to be. It's not 'messy'. There are motion tweens, symbols comprising of 'puppets' with nested groups. The library is very organised with each necessary component accounted for and even renamed- there are no repeated/redundant items in the library. 

I'm using a Macbook Air with 16GB RAM. 

So far, I'm halfway through a 1 minute scene and Adobe Animate is crashing every time I try to export it. Up until a certain level of detail, it was fine and was exporting OK; but after adding a few more details, this problem started and has persisted - if I delete the added details, I can export once again. The issue seems to be associated with the complexity of the scene.

I was once told that this problem was related to my device not having sufficient RAM; however, when I open the device Activity Monitor interface, the memory used whilst attempting to export is not beyond the available memory.  This seems to rule out an inssue relating to insiffucient RAM on my device. 

I can export 10 seconds of the animation at a time. But this is extremely cumbersome. The ability to export it 10 seconds at a time also seems indicates that it's not an issue with some bug in the program or a glitch relatied the items I'm importing in to make the animation.

Does anyone have an understanding of why this may be occurring or what I could to overcome this problem?

Many thanks