There can be several reasons for this. If a "CRS error" occurred, the file doesn’t have an embedded CRS definition or the CRS definition is invalid and the file could not be interpreted in the project CRS either. In such cases, it is worth checking the CRS assigned to the file or the project and trying to upload it again. In the case of "File too large" error, a file exceeding the upper limit of processing was uploaded. The upper limit only affects processing. It doesn’t affect uploading, you can still share and download the original file and you can even upload more files as long as you still have enough storage. We will increase this limit in the future by increasing the capacity of our servers. In the case of "File format error", the uploaded file is probably incorrect, for example, it contains data that is not in the standard format of that file extension. In the case of "Processing error", some unexpected error has occurred, in which case it is worth checking whether the file is corrupted. If you think the file isn’t corrupted, then let us know and we will try to fix the problem! To report an error, use our feedback form: https://surveytransfer.net/feedback/