This help page explains the possible causes of errors when uploading transaction history files from unsupported exchanges into the "Custom File" upload box.
You cannot directly upload transaction history files downloaded from unsupported exchanges to cryptact. Please check the supported exchanges at the following link:
https://grid.cryptact.com/exchanges
Therefore, transaction histories from unsupported exchanges need to be uploaded as "Custom Transactions." Using the files downloaded from unsupported exchanges, you need to manually enter the data into cryptact's custom file format and upload it.
Custom File for any other trades
Additionally, for those who find creating a custom file themselves too troublesome, we offer a "Custom File Creation Service." For inquiries, please contact us through the "Support" option displayed at the bottom right of the help page.