The machine does not recognize the pattern

When the design saved on your USB flash drive is not showing on the embroidery machine screen:

Possible causes:

The pattern size exceeds the largest frame of your machine
The embroidery format is unsuitable (e.g. ART instead of PES)
You are looking in the wrong place, check in which folder you saved the file
The machine displays “bad frame”

You have selected a hoop that is too small for your pattern
The embroidery unit is loose or has shifted
The pattern is the right size but it is not well centered

I bought a design that was too big for my machine

Some sites (but not all!) have you fill out a form to alert you when a chosen design is too large for your largest frame.
Several possibilities after purchase:

reduce the pattern with the embroidery machine (no more than 5-10%, it can cause density problems afterwards, the stitches will be too tight)
reduce the pattern with software (remember to adjust its density)
cut the pattern with a software and embroider it in two parts
buy a new embroidery machine with bigger frame!!! ;))

Choose the right image format

Some image formats will speak a language that will allow you to obtain a better digitization from the outset. These are vector images.
Which software to choose, free or paid?

Free software (for example My Editor) allows you to perform basic but very useful actions, for example changing the format of a pattern, seeing its rendering in 3D, seeing the rendering by changing the colors, reworking the points, editing an image or a pattern template, group, ungroup, cut, copy, paste…
Paid software makes it possible to create different styles of patterns from scratch, or from a drawing, a photo… This requires training in digitization or perseverance to train as an autodidact (easier if you have a basic knowledge of image processing software and machine embroidery).

Is there software to create a pattern in one click?

It’s just a dreamy commercial promise… But even with a good base image, the automatic functions will most of the time produce an embroidery design that needs “manual” improvements before you get an embroidery design. correct.
In short, a beautiful embroidery pattern requires creativity, time to learn, to digitize and test the patterns, technicality and a certain artistic sense…