# Project History and Versions
Each time someone synchronises the project from a mobile device or from QGIS through Mergin Maps QGIS plugin, a new project version will be created. Thus, it is possible to see the details of the changes made in Mergin Maps project by different users or devices.
On app.merginmaps.com, you can view what files have been added or removed. If you use GeoPackage for your survey, you can also see the list of the features which have been added, deleted or updated.
Great tools to inspect the project history and compare changes between project versions can be found in the QGIS plugin:
# Project history
To see the project history:
- Log in app.merginmaps.com and open your project
- Navigate to the HISTORY tab
- Here, you can find:
- the version of the project based on the number of synchronisations. Click on the version to see the changelog.
- the time when was the version created
- the Author of this version (who made the changes)
- overview of the number of files that were added, deleted and updated
- Size of the project
- option to download this version of the project
# Advanced changelog
To see more details of a specific version:
Click on the version number you'd like to view the details
In addition to the Version and Author, you can also see:
Created displays the exact date and time of when was the change synchronised
User Agent indicates device, operating system and tool used to create the version
Files changes contain the summary of changes
Files changes can be expanded to include even more details. If you use GeoPackage for your layers, you can see a summary of features added, deleted or updated for each table (layer).
Here, one layer
parks.gpkgwas added to the project, one layer
survey-testwas removed from the project, the project file
trees-and-hedges.qgzwas modified and there are some changes in the
Let's see what was changed in more detail by clicking on the Show Advanced button.
Now we can see the changes in detail.
- Change denotes the type of change: added, removed or modified feature
geomincludes changes in the feature's geometry
In this case, there are multiple changes in the
treeslayer. One feature (
fid: 5) was added, one feature (
fid: 1) was deleted and the attributes of two features (
fid: 3) were modified. In addition, one of them (
fid: 3) has also changed in geometry: the point was moved to a new position.