# What happen's on Upload and Download?

![](/files/-M2AbftWYcawvKV5tZHZ)

## What's about to Happen?

Whenever you upload or download a Konstru model, the first step is a comparison of the Platform model and the Konstru model. This is called Model Review. 

Konstru inspects/reads the platform model you are looking to upload and creates a , and compares it to the Konstru database model you have chosen to upload to. This same process occurs on any download, where Konstru will first inspect the existing platform model, then make a comparison to the Konstru model chosen for download. This review compares a list of ID's for the object in the two models, and is able to ascertain the status of a particular object based on this comparison. This status then dictates what occurs next in the process.

![](/files/-M2K_Wk7so-URDBqgghd)

{% content-ref url="/pages/-LJu4rAaVd25pv67P25O" %}
[Model Review](/konstru-manual/konstru-general-knowledge/model-review.md)
{% endcontent-ref %}


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