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If the device shows "Memory error" Put the device to sleep, wake it, and open the file again. Right after uploading with the built-in file server, the device may be short of free memory, and even a valid file can fail to open.
Converts PDFs and image ZIPs into .xtch / .xtc files for the Xteink X4 / X3. Everything runs in your browser; your files are never uploaded.
If the device shows "Memory error" Put the device to sleep, wake it, and open the file again. Right after uploading with the built-in file server, the device may be short of free memory, and even a valid file can fail to open.