You can usually do it by connecting your device to the CloudReader and then using the import or upload feature. But make sure you have the legal right to copy the comics.
To copy comics into CloudReader, check if the app supports the file type of your comics. Next, log in to your CloudReader account and find the upload section. Select the comics from your device's storage. Be aware of any copyright restrictions when doing this.
First, make sure your comics are in a compatible format. Then, open the CloudReader app and look for the option like 'Import Comics' or 'Upload Files'. Follow the prompts to select the comics you want to copy. Just remember, only copy comics that you have the proper authorization for.