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You could also use something like Pocket Git to push/pull your changes from/to devices. This way you'd also have a nice history of changes.
Currently, for Azure DevOps there ins't the specific Android client to manage the repos. All the available clients are listed here : Tools and clients that connect to Azure DevOps
However we can use the common git client tools for Android to manage the repos in Azure DevOps, such as the Pocket Git, MGit or other clients mentioned in this blog : Using Git on Android – Free Tools and Guide
I like Pocket Git.