The most common reason why ChatGPT fails to upload files is not that the model "can't understand", but that the file itself has reached its limits. OpenAI's official File Uploads FAQ clearly states: the maximum limit for a single file is 512MB, and text and document files are also subject to 2M tokens; CSV or tables are generally about 50MB, and images are 20MB. In addition, ChatGPT also has a total capacity limit at the user and organization levels, and if it is exceeded, it will directly report an error. The official address is the OpenAI File Uploads FAQ.
Let's look at the easiest points to step on first
If you're sending large PDFs, long documents, or scanned copies with many pages, failures are often related to volume, token limits, or mixed graphics. OpenAI has also warned that complex layouts can make parsing worse. The safest way is not to hard transmit, but to first disassemble the file, compress the size, or divide a large package of data into multiple smaller files.
There is also a limit on the number of files in the project
If the problem occurs in GPT or Project, it also depends on "how many files can be placed per GPT/project". According to the official instructions, GPT and projects have a maximum number of files, and even if a single file is not overweight, it may fail. Many people mistakenly think that the upload button is broken, but in fact it is just the project capacity has arrived.
More stable processing sequence
- Compress or split the file before uploading it again.
- Check if the project/GPT file count is full.
- If it's a custom GPT, confirm that the appropriate file analysis capabilities are enabled.
Therefore, when ChatGPT fails to upload a file, the most reliable order to check is always: first look at the size, then look at the number of files, and finally see if it is a problem with the model or format.
