I have already noticed several times that the upload and download was not complete or was cancelled in between. The user is not always sufficiently informed about this situation. The upload and download must therefore be carried out several times and the user is still unsure whether the data is complete.

The upload and download process should be expanded with a function,
- that detects cancelled uploads and downloads and resumes them continuously as soon as it is possible again. Currently, the upload or download has to be restarted. The use of Proton Drive is not convenient, especially for Internet connections with short communication interruptions.
- A function that checks the upload and download via CheckSum or similar and thus gives the user the opportunity to check the data integrity of the transmitted data. Ideally, synchronisation should be permanently active.

Thank you in advance for your consideration of my suggestion and the inclusion of these functions in Proton Drive.